Feature:1. USB charging port, intelligent charging, simple and convenient for using.2. With low voltage alarm, when the battery power is low, the smart lock will emit a low battery alarm.3. It can replace the standard single-cylinder American door lock, suitable for left/right/inside/outside opening door, and the door thickness is suitable for 35-55mm.Specification:Condition: 100% Brand NewItem Type: Door Handle LockMaterial: Zinc AlloyOptional Color: Chrome, BlackFingerprint Capacity: 20 GroupsPower Supply: 1 x 3.7V 14500 Rechargeable Battery (Built-in)Emergency Power Supply: USB ChargingRecognition Speed: 0.5sFingerprint Sensor: SemiconductorService Life:> 200,000 TimesUnlocking Method: Fingerprint / Password / App / Temporary PasswordApplicable Door Thickness: Approx. 35-55mm/1.4-2.2inPackage List:1 x Lock Front Panel1 x Lock Rear Panel1 x Single Latch1 x Lock Box1 x Buckle1 x Screw Bag1 x Instruction1 x Mounting Kit