{"title":"Smart lock comparison","description":null,"products":[{"product_id":"keypad-smart-lock-pcb41","title":"WELOCK Smart Lock PCB41 Keypad Door Lock Cylinder","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong data-mce-fragment=\"1\"\u003eMultiple Ways To Unlock: \u003c\/strong\u003eOpening the door with a numeric code, with an RFID card, or with the WELOCK app, a temporary password. \u003cmeta charset=\"utf-8\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eUp to 20 cards can be added to the Smart Lock. One card can be added to many locks and you can only use one smart card to open more than one of our locks.\u003c\/span\u003e If you need a WiFi remote unlock function, please buy a Bluetooth gateway separately.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003cp\u003e\u003cstrong\u003eEasy Install:\u003c\/strong\u003e  Suitable for all doors with a thickness between \u003cstrong\u003e 50mm-100mm.\u003c\/strong\u003e Easy to replace the existing lock cylinder in your front door or apartment door without drilling. Easy installation in 5 minutes.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003ePerfect for Home, Airbnb and Rental: \u003c\/strong\u003eThe\u003cspan\u003e WELCOK Smart Lock, is perfect for both family homes and rental properties. It can store up to 10 codes directly on the lock, including 1 admin code and 9 user codes, ideal for family members or frequent visitors. For rental scenarios, the lock provides the flexibility of adding an unlimited number of guest passwords and RFID cards with expiration dates through its app, catering seamlessly to a high turnover of tenants or short-term guests. \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003c\/span\u003e\u003cstrong\u003eSmart WELOCK App:\u003c\/strong\u003e WELOCK Password Smart Lock can be controlled in the WeLock app for iOS and Android, you can use Bluetooth to open the door; add a smart card; add an app user; see unlocking history, and share passwords to your guests.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e1-Year Battery Life: \u003c\/strong\u003eThe OLED displays battery status, settings, and warnings. Battery for electronic knob: 3 x AAA 1.5 V. Up to 1-year runtime with 10 openings per day. Low battery reminder When the battery is below 20%, you will be reminded to replace the battery.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv style=\"position: absolute; left: -182px; top: -20px;\" id=\"gtx-trans\"\u003e\n\u003cdiv class=\"gtx-trans-icon\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"WELOCK Official","offers":[{"title":"PCB41 \/ Euro Profile","offer_id":41772245549216,"sku":"PCB41","price":149.0,"currency_code":"EUR","in_stock":true},{"title":"PCB41+ WIFIBOX3 \/ Euro Profile","offer_id":42815702663328,"sku":"PCB41-WIFI","price":239.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0550\/5377\/9104\/files\/welock-smart-lock-pcb41-keypad-door-lock-cylinder-8258586.jpg?v=1752333990"},{"product_id":"welock-fingerprint-electronic-smart-door-lock-cylinder-touch41","title":"WELOCK Smart Lock Cylinder Touch41 Fingerprint Door Lock","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003eMultiple ways to unlock the door\u003c\/strong\u003e: Never forget your key again—simply open your door by fingerprint, with RFID card, or with the WELOCK app. Memory for up to 100 fingerprints (3 with admin function). Up to 20 cards can be paired. Apps for iOS and Android are available. WELOCK, via extra WIFIBOX3 for remote control.\u003cbr\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eElectronic lock cylinder size: \u003c\/strong\u003eDiameter of knobs\u003cstrong\u003e:\u003c\/strong\u003e outer 46 mm \/ inner 38 mm; length: outer 56 mm \/ inner 57 mm. Cylinder length: adjustable outside 40 mm - 55 mm \/ inside 30 mm - 60 mm. Suitable for most all Euro profile doors with a thickness between 50 mm and 100 mm.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eOLED display of battery status\u003c\/strong\u003e: settings and alerts. Battery for electronic knob: 3 x AAA 1.5 V. Ten times unlocking per day will last for 8-10 months. When the battery is empty, you can use the USB backup to unlock. The USB power bank is for unlocking and cannot be charged.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSafety and environment of use\u003c\/strong\u003e: Electrostatic protection up to 30,000 volts. With an IP65 waterproof rating, Smart Lock is ready to protect homes in any location. (Only suitable for doors with roofing, not for garden gate exterior doors). Safety in case of fire, etc. Can always be opened from the inside. Up to 10 million closing operations. Working temperature: -25°C to 60°C.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy Installation and Reliable Customer Support\u003c\/strong\u003e: Easy to replace with an existing locking cylinder in your front door or apartment door without drilling in 10 minutes. and enjoy peace of mind with a 2-year warranty and 24\/7 customer service support.\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"WELOCK","offers":[{"title":"Touch41 \/ Euro Profile","offer_id":42472912355488,"sku":"TOUCH41","price":189.0,"currency_code":"EUR","in_stock":true},{"title":"Touch41+WIFIBOX3 \/ Euro Profile","offer_id":42815708168352,"sku":"TOUCH41-WIFIBOX3","price":259.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0550\/5377\/9104\/files\/welock_smart_lock_touch41.jpg?v=1761198534"},{"product_id":"welock-fingerprint-electronic-smart-door-lock-cylinder-with-remote-control-sbr","title":"WELOCK Fingerprint Electronic Smart Door Lock Cylinder with Remote Control SBR","description":"\u003cmeta charset=\"utf-8\"\u003e\n\u003cul class=\"a-unordered-list a-vertical a-spacing-mini\" data-mce-fragment=\"1\"\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eFingerprint Identification:\u003c\/strong\u003e\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003eSmart Lock recognizes your fingerprint in just 0.5 seconds, and unlocks your door in 1 second. It’s faster than fumbling for your keys. Store up to 500 fingerprints.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003eRemote Control: \u003c\/strong\u003eRemote controls with digital conversation systems, cannot be decoded or duplicated. Anti-theft and bring you safety. With the remote control, you can put it everywhere in your house. You can control the door locks from anywhere in your home, which is very convenient. \u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong data-mce-fragment=\"1\"\u003e3 Ways to Unlock\u003c\/strong\u003e: Open in an instant using your fingerprint, unlock via the Welock App with Bluetooth or the Remote Control in your home. Works with Wi-Fi Bridge for Wifi remote control (sold separately).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003e\u003cstrong\u003eSafety\u003c\/strong\u003e: Electrostatic protection up to 30,000 volts.\u003cspan\u003e \u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003eWith an IP65 weatherproof rating, Smart Lock is ready to protect homes in any location. \u003c\/span\u003e(Only suitable for doors with roofing, not for garden gate exterior doors).Safety in case of fire etc.Can always be opened from the inside. Up to 10 million closing operations. Working temperature: -10°C to 60 °C.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cstrong data-mce-fragment=\"1\"\u003eEuropean Standard Lock Cylinder:\u003c\/strong\u003e  Suitable for all doors with a thickness between 50mm-100mm. Easy to replace the existing lock cylinder in your front door or apartment door without drilling. Please check compatibility before purchasing.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"WELOCK","offers":[{"title":"SBR \/ Euro Profile","offer_id":43544038277280,"sku":"SBR20EBL41","price":259.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0550\/5377\/9104\/products\/welock-fingerprint-electronic-smart-door-lock-cylinder-with-remote-control-sbr-3529532.jpg?v=1752333984"},{"product_id":"welock-fingerprint-electronic-smart-door-lock-cylinder-secbn51","title":"WELOCK Smart Lock Fingerprint Door Lock Cylinder SECBN51","description":"\u003cdiv style=\"text-align: center;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003e\n\u003cdiv\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cul data-mce-fragment=\"1\"\u003e\n\u003cli\u003eOpen the door by fingerprint, with RFID card, or with our app. Memory for up to 100 fingerprints (3 of them with admin function). Up to 20 cards can be paired. Apps for iOS and Android are available: WELOCK.\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003eCylinder dimensions:  Suitable for all doors with thicknesses between 30-70mm. Easy to replace the existing lock cylinder in your front door or apartment door without drilling. \u003cmeta charset=\"utf-8\"\u003e\u003cspan data-mce-fragment=\"1\"\u003eWith an extended lock cylinder component, our lock can easily accommodate doors with a thickness of up to 100mm.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003eThe OLED display of battery status, settings, and alerts. Battery for electronic knob: 3 x AAA 1.5 V. Ten times unlocking per day will last for 8-10 months. When the battery is empty, you can use the USB backup to unlock it. The USB power bank is for unlocking and can not be charged.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003eSafety: Electrostatic protection up to 30,000 volts.\u003cspan data-mce-fragment=\"1\"\u003e \u003c\/span\u003e\u003cspan data-mce-fragment=\"1\"\u003eWith an IP54 waterproof rating, Smart Lock is ready to protect homes in any location. \u003c\/span\u003e(Only suitable for doors with roofing, not for garden gate exterior doors).Safety in case of fire etc.Can always be opened from the inside. Up to 10 million closing operations. Working temperature: -10°C to 60 °C.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-mce-fragment=\"1\"\u003e\n\u003cp data-mce-fragment=\"1\"\u003ePackaging includes: set of 1x WELOCK SECBN51 electronic lock, 3 RFID cards, 1x Special Allen key,1x\u003cmeta charset=\"utf-8\"\u003e\u003cspan data-mce-fragment=\"1\"\u003e extended lock cylinder component,\u003c\/span\u003e 1x manual Material: stainless steel with zinc alloy, plastic. Warranty: two years. Our customer service is always there for you.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"WELOCK","offers":[{"title":"SECBN51 \/ Euro Profile","offer_id":47139843571872,"sku":"SECBNEBL51","price":189.0,"currency_code":"EUR","in_stock":true},{"title":"SECBN51+WIFIBOX3 \/ Euro Profile","offer_id":47139843604640,"sku":"SECBN51-WIFIBOX3","price":259.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0550\/5377\/9104\/products\/welock-smart-lock-fingerprint-door-lock-cylinder-secbn51-4377769.jpg?v=1752333986"},{"product_id":"pcb51-bluetooth-smart-lock-with-keypad","title":"WELOCK PCB51 Bluetooth Smart Lock with keypad","description":"\u003cul\u003e\n\u003cli\u003e5 Ways to Unlock: Open your door via the WELOCK app, using the keypad, by WiFi remote unlocking, by using your voice with Amazon Alexa (WIFIBOX3 sold separately), or by RFID card.\u003c\/li\u003e\n\u003cli\u003eRemote Access and Real-Time Notifications: The WELOCK smart door lock can be controlled in the WELOCK app for iOS and Android. Stay connected to your home with the WELOCK app, offering no monthly fee for remote door management, immediate notifications, and a low battery alarm, so you're always informed, no matter where you are.\u003c\/li\u003e\n\u003cli\u003ePerfect for Home, Airbnb, and Rental: The WELOCK PCB51 smart door lock is ideal for both your home and your business. 10 codes (1 admin code and 9 user codes) can be added directly to this lock, and more codes can be created via the app. \u003c\/li\u003e\n\u003cli\u003eLong-Lasting Battery Life and Durable Build: With 3 x AAA 1.5 V batteries and a durable construction that can survive extreme weather (waterproof: IP65 and operating temperature: -25ºC~60ºC), ensuring reliability all year round for your keyless entry system. \u003c\/li\u003e\n\u003cli\u003eEasy Installation and Reliable Customer Support: Compatible with euro profile cylinders (door thickness 30-70mm); easy to replace the original lock cylinder in just 10 minutes without the need for drilling; and have peace of mind with a 24-month warranty and 24\/7 customer assistance.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"WELOCK","offers":[{"title":"PCB51 \/ Euro Profile","offer_id":51983851061408,"sku":"PCB10EBL51","price":169.0,"currency_code":"EUR","in_stock":true},{"title":"PCB51+WIFIBOX3 \/ Euro Profile","offer_id":52309812510880,"sku":"PCB51+WIFIBOX3","price":249.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0550\/5377\/9104\/files\/welock-pcb51-bluetooth-smart-lock-with-keypad-8039958.jpg?v=1752333986"},{"product_id":"smart-lock-touca51-fingerprint-keypad-door-lock","title":"WELOCK Smart Lock Cylinder ToucA51 Fingerprint Door Lock with Keypad","description":"\u003col\u003e\u003c\/ol\u003e\n\u003ch3 data-start=\"99\" data-end=\"142\"\u003e\n\u003cmeta charset=\"utf-8\"\u003e \u003cmeta charset=\"utf-8\"\u003e1. \u003cmeta charset=\"utf-8\"\u003e \u003cstrong data-end=\"140\" data-start=\"106\"\u003e6-in-1 Smart Unlocking Methods\u003c\/strong\u003e\n\u003c\/h3\u003e\n\u003cul data-end=\"605\" data-start=\"220\"\u003e\n\u003cli data-end=\"267\" data-start=\"220\"\u003e\n\u003cp data-end=\"267\" data-start=\"222\"\u003e\u003cstrong data-end=\"237\" data-start=\"222\"\u003eFingerprint\u003c\/strong\u003e unlocking—fast and secure\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"337\" data-start=\"268\"\u003e\n\u003cp data-end=\"337\" data-start=\"270\"\u003e\u003cstrong data-end=\"282\" data-start=\"270\"\u003ePIN code—\u003c\/strong\u003esupports up to 200 codes with anti-peep protection\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"400\" data-start=\"338\"\u003e\n\u003cp data-end=\"400\" data-start=\"340\"\u003e\u003cstrong data-end=\"353\" data-start=\"340\"\u003eRFID card—\u003c\/strong\u003etap to unlock, perfect for kids or seniors\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"455\" data-start=\"401\"\u003e\n\u003cp data-end=\"455\" data-start=\"403\"\u003e\u003cstrong data-end=\"420\" data-start=\"403\"\u003eBluetooth app—\u003c\/strong\u003econtrol via WELOCK app locally\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"526\" data-start=\"456\"\u003e\n\u003cp data-end=\"526\" data-start=\"458\"\u003e\u003cstrong data-end=\"482\" data-start=\"458\"\u003eUSB emergency unlock—\u003c\/strong\u003epower the lock even with dead batteries\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"605\" data-start=\"527\"\u003e\n\u003cp data-end=\"605\" data-start=\"529\"\u003e\u003cstrong data-end=\"552\" data-start=\"529\"\u003eAlexa voice control—\u003c\/strong\u003eunlock remotely via \u003cstrong data-end=\"587\" data-start=\"575\"\u003eWIFIBOX3\u003c\/strong\u003e (sold separately)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"701\" data-start=\"607\"\u003eIdeal for homes, Airbnbs, rentals, and offices—enjoy full keyless freedom anytime, anywhere.\u003c\/p\u003e\n\u003ch3 data-start=\"80\" data-end=\"138\"\u003e\u003cstrong data-start=\"84\" data-end=\"136\"\u003e2. Adjustable Smart Cylinder Fit for 55–95mm Euro Profile Doors\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"460\" data-end=\"688\"\u003eSmart Lock ToucA51 is compatible with most \u003cstrong data-start=\"537\" data-end=\"577\"\u003ewooden, interior, and entrance doors\u003c\/strong\u003e. The adjustable lock cylinder makes it easy to retrofit on \u003cstrong\u003e55–95 \u003c\/strong\u003e\u003cstrong data-start=\"637\" data-end=\"660\"\u003emm thick doors\u003c\/strong\u003e without professional tools.\u003c\/p\u003e\n\u003ch3 data-start=\"695\" data-end=\"915\"\u003e\u003cstrong data-start=\"695\" data-end=\"739\"\u003e3. Battery Powered with Long Lifespan\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"695\" data-end=\"915\"\u003ePowered by \u003cstrong data-start=\"753\" data-end=\"772\"\u003e3×AAA batteries\u003c\/strong\u003e, the lock delivers reliable performance for \u003cstrong data-start=\"817\" data-end=\"833\"\u003e10–12 months\u003c\/strong\u003e under normal use. Low battery warning included to ensure you’re never locked out.\u003c\/p\u003e\n\u003ch3 data-start=\"922\" data-end=\"1165\"\u003e\u003cstrong data-start=\"922\" data-end=\"970\"\u003e4. Built to Last—Durable \u0026amp; Weatherproof\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"922\" data-end=\"1165\"\u003eConstructed with \u003cstrong data-start=\"990\" data-end=\"1022\"\u003estainless steel + PC plastic\u003c\/strong\u003e, Touca51 withstands daily wear and harsh conditions. It operates reliably from \u003cstrong data-start=\"1102\" data-end=\"1119\"\u003e-25°C to 60°C\u003c\/strong\u003e and endures over \u003cstrong data-start=\"1137\" data-end=\"1164\"\u003e100,000 pressing cycles\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3 data-start=\"114\" data-end=\"182\"\u003e\u003cstrong data-start=\"121\" data-end=\"180\"\u003e5. Easy DIY Installation—No Drilling or Locksmith Needed\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"183\" data-end=\"524\"\u003eInstall your \u003cstrong data-start=\"196\" data-end=\"231\"\u003eWELOCK smart lock euro cylinder\u003c\/strong\u003e in under 10 minutes—no wiring, no drilling, and no locksmith required.\u003cbr data-start=\"304\" data-end=\"307\"\u003eThis \u003cstrong data-start=\"312\" data-end=\"340\"\u003eretrofit smart door lock\u003c\/strong\u003e fits most 55–95 mm\u003cstrong\u003e Euro-profile doors\u003c\/strong\u003e, making it the perfect upgrade for modern homes, rentals, or offices.\u003cbr data-start=\"452\" data-end=\"455\" data-is-only-node=\"\"\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cimg\u003e\u003c\/p\u003e","brand":"WELOCK","offers":[{"title":"ToucA51 \/ Euro Profile","offer_id":52074240934048,"sku":"TOUCAEBL51","price":169.0,"currency_code":"EUR","in_stock":true},{"title":"ToucA51+WIFIBOX3 \/ Euro Profile","offer_id":52309807693984,"sku":"ToucA51+WIFIBOX3","price":268.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0550\/5377\/9104\/files\/welock-smart-lock-cylinder-touca51-fingerprint-door-lock-with-keypad-4184798.jpg?v=1752333987"},{"product_id":"welock-touch63-fingerprint-door-lock-cylinder","title":"WELOCK Smart Lock Touch63 Fingerprint Door Lock for Euro Profile Cylinder","description":"\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMultiple unlocking methods:\u003c\/strong\u003e fingerprint(include 3 administrator fingerprints, 97 user fingerprints), smart card(up to 20 cards), mobile APP (via Bluetooth), USB emergency backup key, WiFi remote unlocking (WIFIBOX3 required), Alexa voice control (WIFIBOX3 required)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy DIY installation:\u003c\/strong\u003e WELOCK Touch63 front handle is removable and can be installed from the interior or exterior, and fits most European standard doors with a thickness of 50-100 mm—no drilling or wiring required\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafe and reliable:\u003c\/strong\u003e powered by 3*AAA batteries (sold separately); waterproof to IP65 (for interior doors or exterior doors with roofs); can work normally at temperatures from -25°C to 60°C; static protection up to 30,000 volts; can always be unlocked from the inside in the event of a fire; when the battery is dead, can be unlocked by using the USB emergency backup method (not rechargeable)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmart lock size:\u003c\/strong\u003e knob diameter: Outside 38.5mm\/Inside 33mm; Length: Outside 60mm\/Inside 30mm. Electronic locking cylinder length: adjustable outside 40mm-55mm\/inside 30mm-60mm. The length of the cylinder itself is 40\/30 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReliable service:\u003c\/strong\u003e our dedicated 24\/7 customer service team is always on hand to help you. We have local warehouses in Europe for fast, free shipping. 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