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 1.5s 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. [ If you encounter any issue, please contact customer service. Eufy is on standby for you 7*24h] Enjoy a 18-month protection backed by professional customer service, you can contact us by telephone, email, and LiveChat. Security and Durability: 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.