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. 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. 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. 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. Easy Battery Change: With easy battery change, it saves money and is more convenient when turned off. Long lasting battery. Specifications: Connectivity Bluetooth 4.0, WiFi (G2 Bridge is required) Voice Control via Alexa: Yes but gateway is required. Unlock Mode: Password & # 43; IC card & # 43; TTLock (BT) & # 43; Digital printing & # 43; Manual Keys Password Capacity: 150 IC Card Capacity: 200 Fingerprint Capacity: 120 Fingerprint Reading: Semiconductor Sensor Button Type: Capacitive Touch Button Reading Time: 0.5S Working Power: 4 x AA Battery (Not Included) Operating Temperature: -30 to 70C Suit for the door thickness of about 35-65mm Information Package Color: Black Material: metal+plastic Package Contents: 1 x Door Lock Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.