1. Multiple methods of unlockingTuya App / TT lock App(Options), fingerprint, card, mechanical key unlock; easy to use it whether children or older. Never worry forget to bring the key. 2.APP remote controlThis keyless entry door lock allows you to check the visitor records on Tuya APP/TT Lock, see which visitor at what time unlocked the door, enhance the security level of your home. When the door lock and gateway are used together, the APP can be used to remotely control the unlocking. 3. TT Lock Version With G2 gateway(buy extra) Works with Smart Alexa or Google Home, Realize smart homeA1 TT Lock version combined with the Gateway provides the most convenient experience by simply asking your smart speaker Alexa to lock or unlock our lock. 4. Mechanical keys and emergency power supply (Type-C) can be used when the door lock is out of power 5. Long battery life, 4 pcs AA batteries(Not included) can provide 5000 openings (approx. 6 months). Upgraded anti-touch feature. Unlock as long as the numbers you enter contain the correct sequential code., Manufacturer: DMETE