About this item: TTLock App Compatible: TTLock App is a app, with multiple functions, including send password/temporary remotely, manage password/, view access logs, open lock by APP remotely or almost, mode setting passing, etc. Low battery alarm: When the battery power is less than 4.8V, the alarm is activated each time with unlocking to remind you to replace the battery in time, and the lock can be unlocked 200 times after the first alarm. With this smart door lock, you are free to use fingerprint, password, IC card, manual keys to unlock. You can also use the phone APP to remotely control it wherever you are. This excellent makeover product ensures maximum flexibility and convenience for your life. Mechanical key unlock: Spare mechanical key and external power supply interface in case the batteries run out.Multiple ways to unlock: BT unlock, TTLock APP remote unlock, fingerprint unlock, password unlock, IC card unlock, key unlock. Easy Battery Change: With easy battery change, it saves money and is more convenient when turned off. Long lasting battery., Weight: 2.07344757411 Pounds, Manufacturer: Prterver