Features:* Dual core and dual system, open faster, response quicker.* Two different ways to open and close, with the remote control and the spinning roulette.* Easy and firm installation with the external mounting plate.* Mute lock/unlock operation: Open/close lock has no DiDi prompt sound, but when the battery is low there is DiDi prompt alarm sound.* Once the main batteries are depleted, you can use the backup battery, no worries about dead battery and be locked outside.* 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.* The bottom panel design makes installation easier and more stable.* 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: 2* 12V 27A Battery for Remote Control (included), 1* 23A 12V Battery (included) 4* AA Battery (Not Included) for Door LockUnlock Current: 120mAhBattery Life: 4 batteries last for 16 months in standby modeWorking Temperature: -10-60Working Humidity: 20%-80%Lock Tongue Moving Distance: 22mmMaterial: Stainless SteelItem Size: 137*77*37mm/5.39*3.03*1.45inItem Weight: 670g/23.67ozPackage Size: 23.0*17.0*6.5cm/9.05*6.69*2.55inPackage Weight: 1056g/37.24ozPackage List:1* Door Lock1* Bottom Gusset Plate1* Door Bolt Holder1* Screw Kit1* 23A 12V Battery2* Remote Controller1* English-Chinese User Manual