Feature:1. Low voltage alarm function, when the battery power is low, the smart lock will emit a low battery alarm.2. Enter garbled characters before and after unlocking the password, as long as there is a continuous correct password in the middle, the door can be unlocked to prevent people from peeping and trying to open the door.Specification:Conditon: 100% Brand NewItem Type: Fingerprint Handle LockMaterial: Zinc AlloyColor: As Pictures ShownLock Lever Size: Approx. 145 x 26mm/5.7 x 1.0inBluetooth Standard: Bluetooth 4.1BLESupport Mobile Phone System: Support for Android 4.3/for IOS 7.0 or aboveFingerprint Number: 120Number of Passwords: Custom Password: 120 groups APP Send Password: UnlimitedPower Supply: 4 x AAA batteries (not included)Emergency Power Supply: USB ChargingRecognition Speed: 0.5sFingerprint Sensor: SemiconductorService Life: >200,000 timesUnlocking Method: fingerprint/password/Bluetooth App/keyVoltage Range: 4.5-10VLow Voltage Alarm Voltage: 4.8VWorking Temperature: -20-70℃ Package List:1 x Fingerprint Lock Front Panel1 x Rear Panel1 x Single Tongue Lock Body1 x Lock Box1 x Lock Catch1 x Instruction Manual1 x Installation Kit Bag1 x Square Steel Bar2 x Key