Note: With WiFi Adapter, can achieve remote control the lock by phone APP. Features: *No lock hole design, it completely abandons the traditional key and lock, open and close by remote control or APP (Tuya / SmartLife), realized real security. *Three unlock modes optional: Phone APP unlock, Remote control unlock, indoor Button unlock. * Dual core and dual system, open faster, response quicker. Easy and firm installation with the external mounting plate. * Remote controls with digital conversation system, it cannot be decoded or duplicated. Anti-theft and bring you safety. * Made of stainless steel, provide long service life, very strong and steady. Power saving and low battery consumption. * Once the main batteries are depleted, you can use the backup battery, no worries about dead battery and be locked outside. * Ideal for office, home, hotel, anti-theft door, corridor door, wooden doors, garage door, etc. Specifications: Remote Control Distance: 0-20m(open space) Power Supply: 4* 12V 27A Battery for Remote Control (included), 1* 23A 12V Battery (included) & 4* AA Battery (Not Included) for Door Lock Unlock Current: 120mAh Battery Life: 4 batteries last for 16 months in standby mode Transmission Frequency: 433MHz(500KHz) Operation Range: Within 20m Unlock Mode: APP unlock&Remote control unlock&indoor Button unlock APP Support: iOS/Android Working Temperature: -10-60 Working Humidity: 20%-80% Lock Tongue Moving Distance: 22mm Material: Stainless Steel Item Size: 137*77*37mm/5.39*3.03*1.45in Item Weight: 670g/23.67oz Package Size: 23.0*17.0*6.5cm/9.05*6.69*2.55in Package Weight: 1056g/37.24oz Package List: 1* Door Lock 1* Bottom Gusset Plate 1* Door Bolt Holder 1* Screw Kit 1* 23A 12V Battery 4* Remote Controller 1* USB Wifi Adapter 1* English-Chinese User Manual