1. Support for 12V home power and VV batteries （If two types of power sources are used simultaneously, it will prioritize the use of household power sources, and the battery will serve as a backup power source） 2. Connect a household ordinary switch and unlock it through the switch 3. Connected to building intercom system interface TTLock Version A super good APP: If you have used tuya and ttlock, you will always choose ttlock in the future ★Easily set all functions on the app without having to read the manual or slowly set them through the keyboard ●Send temproary passcode/ekey remotely ●Manage passcode, ekey ●View access logs ●Open the lock by app remotely or nearly. ●Passage mode setting ●Upload attendance records to APP remotely without gateway(Super useful features) ●Get the unlock records ●Change a time of battery can be used for 12 months(50% less power consumption than TUYA) Other attributes ●waterproof ●Secure password input: Other numbers can be entered before and after the correct password to avoid being peeked at