2 way open the door: fingerprint unlock, key to unlockSemiconductor fingerprint unlock, 360 precise recognitionWith USB charging interface for emergencyLow voltage alarmLeft and right handle interchangeZinc alloy material, wear resistant and corrosion resistantPowered by 4 AAA batteries, 365 days standby timeSpecification:Material: Zinc alloyUnlock mode: Fingerprint or mechanical keyFingerprint capacity: 20Fingerprint read: semiconductor sensorRead time: 0.5SWorking power: 4 x AAA batteries (Not included)Operating temperature: -20 to 60CSuit for the door thickness: about 35-55mmApplication: Wooden Door / Metal DoorPackage included:1 x Zinc Alloy Smart Fingerprint Lock Biometric Electronic Door Handle Lock with Mechanical Key1 x English User ManualOther items not included