Material:aluminium alloy Model Number:K7 PRO Certification:NONE Smart home platform:Tuya Unlock Method:Fingerprint, Password, IC Card, Mechanical Key ,APP APP Name:Tuya Bluetooth Suit For Door Type:Wooden, stainless steel, bronze, Double, Old-fashioned security doors Color:Black Charging:Support USB chagre Language:English Voice and menu Working Voltage:Built in Rechargeable lithium battery. Handle direction:Left Open and Right Open All compatible Main Feature Model: K7 Pro System: Tuya Bluetooth 4.0 Material: Aluminium Alloy Unlock modes: Tuya APP / Fingerprint / Password / Smart card / Key Fingerprint read: FPC Sensor (Semiconductor Sensor) Color: Black User(fingerprint/card/password): Total 99 Chip Type: Dual Core Driver Touch screen: IML Material Working power: 4 x AAA 1.5V batteries (not include) Operating temperature: -20 to 55 Centigrade Password function: support virtual password Suit for the door thickness about 35-55mm