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 Lock Unlock Current: 120mAh Battery Life: 4 batteries last for 16 months in standby mode 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 2* Remote Controller 1* English-Chinese User Manual