Product Features Equipped with dual core and dual system for faster opening and quicker response. Accessible through remote control or spinning roulette for convenience. Easy, secure installation with an external mounting plate. Remote control features a digital conversation system for enhanced security, protecting against decoding and duplication. Constructed with durable stainless steel for a long-lasting, robust, and steady performance. Energy efficient with low battery consumption; includes a backup battery option to prevent lockouts. Bottom panel design ensures easier and more stable installation. Perfect for a variety of doors: office, home, hotel, anti-theft, corridor, wooden, garage, and more. Specifications Remote Control Distance: 10m (32.8ft) Power Supply: 4 x 12V 27A Batteries for Remote Control (included) 1 x 23A 12V Battery (included) 4 x AA Batteries for Door Lock (not included) Unlock Current: 100mAh Battery Life: Lasts up to 16 months in standby mode Working Temperature: -20°C to 70°C Working Humidity: 20% to 80% Lock Tongue Moving Distance: 23mm (0.90in) Material: Stainless Steel Package Size: 23.0 x 17.0 x 6.5cm (9.05 x 6.69 x 2.55in) Package Weight: 1056g (37.24oz) Package List 1 x Door Lock 1 x Bottom Gusset Plate 1 x Door Bolt Holder 1 x Screw Kit 1 x 23A 12V Battery 4 x Remote Controller 1 x English-Chinese User Manual