Product Details 8 Months Battery Life: With 8 AA batteries, Smart Lock C220 runs around 8 months. Experience ultimate convenience and peace of mind with our long-lasting power solution. *May vary depending on the frequency of the lock being used. Self-learning AI: Fingerprint door lock recognition gets more precise with every touch, so you don't have to try agian and again to get in. Never be awkward or upset at unlocking the door. ?6 Ways to Unlock?Unlock with a touch for less than 1s with fingerprint lock. You can also open your front door lock via the eufy Security app, using the keypad or physical key, from Apple Watch, or use your voice with Alexa/Google Voice Assistant. Control from Anywhere with Built-in Wi-Fi: No bridge required, you can control your wifi smart lock from anywhere via the eufy Security app. Easy setup. (Access management, Real-time notification, Event History)?Integrated eufy ecosystem?If you have a eufy doorbell, you can add your wifi door lock to your routines and control devices together for keyless entry within the eufy Security app. Easy Installation and Excellent Customer Service: Compatible with most standard US CA deadbolts. 15-minute easy install without drilling. ?Eufy is on standby for you 7*24h?Enjoy a worry-free 18-month warranty backed by professional customer service, you can contact us by telephone, email, and LiveChat. Security and Durability: BHMA Grade 3 Certified after being locked and unlocked more than 100,000 times. Send an alarm triggered by an unusual attempt to open your smart deadbolt lock. Operating temperatures range from -22? to 158? (-30? to 70?). IP53 Waterproof. FAQ 1.How many passcodes and fingerprints can the eufy Security Smart Lock C220 store? A:Up to 50 fingerprints and 100 different passcodes. 2.How long does the battery last?How to unlock Wi-Fi Smart Lock when the battery dies? A:Roughly 8 months depending on usage(10 times unlock through keypad or app). You'll get a notification when the battery is low. If the battery dies, you can power it up via the port on the bottom of the exterior lock. (Includes 2 physical keys.) 3.What temperatures can the Smart Lock C220 handle? A:The exterior assembly can handle temperatures within the range of -22? to 158? (-30? to 70?). We do not recommend using the Smart Lock outside of these conditions. 4.Is Smart Lock C220 compatible with eufy ecosystem, Apple HomeKit, IFTTT, or Matter? A: It works with eufy doorbell. However, It's NOT compatible with Apple HomeKit, IFTTT, or Matter yet.Neither does it work with eufy HomeBase or any wifi bridge. 5.Whats the requirement for installation? A:Please check the Compatibility infographic above for specific requirement. Dimensions required: Crossbore center to the top of handleset greater than 45 mm; Door thickness: 35 mm-55 mm. NOT Compatible with Mortise Lock. Easy Setup Without Br