Features:x Dual core and dual system, open faster, response quicker.x Two different ways to open and close, with the remote control and the spinning roulette.x Easy and firm installation with the external mounting plate.x Mute lock/unlock operation: Open/close lock has no DiDi prompt sound, but when the battery is low there is DiDi prompt alarm sound.x Once the main batteries are depleted, you can use the backup battery, no worries about dead battery and be locked outside.x Remote controls with digital conversation system, it cannot be decoded or duplicated. Anti-theft and bring you safety.x Made of stainless steel, provide long service life, very strong and steady. Power saving and low battery consumption.x The bottom panel design makes installation easier and more stable.x 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: 2x 12V 27A Battery for Remote Control (included), 1x 23A 12V Battery (included) 4x AA Battery (Not Included) for Door LockUnlock Current: 120mAhBattery Life: 4 batteries last for 16 months in standby modeWorking Temperature: -10-60Working Humidity: 20 percent -80 percent Lock Tongue Moving Distance: 22mmMaterial: Stainless SteelItem Size: 137x77x37mm/5.39x3.03x1.45inItem Weight: 670g/23.67ozPackage Size: 23.0x17.0x6.5cm/9.05x6.69x2.55inPackage Weight: 1056g/37.24ozPackage List:1x Door Lock1x Bottom Gusset Plate1x Door Bolt Holder1x Screw Kit1x 23A 12V Battery2x Remote Controller1x English-Chinese User Manual"