Features: Dual core and dual system: Experience faster opening and quicker response times. Multiple access options: Conveniently open and close using a remote control or the innovative spinning roulette. Easy installation: Securely install with the included external mounting plate. Quiet operation: Enjoy silent lock/unlock operations. A "DiDi" sound alarm notifies you when the battery is low. Backup battery support: Continue using the lock even if the main batteries are depleted, ensuring you're never locked out. Secure remote controls: Digital conversation system ensures the remote cannot be decoded or duplicated, providing enhanced security. Durable build: Constructed from stainless steel for a long-lasting, robust design. Features power-saving technology with low battery consumption. Stable installation: The bottom panel design simplifies and stabilizes the installation process. Versatile use: Perfect for offices, homes, hotels, anti-theft doors, corridor doors, wooden doors, garages, and more. Specifications: Remote Control Distance: 0-20 meters (in open space) Power Supply: 2 * 12V 27A Battery for Remote Control (included), 1 * 23A 12V Battery (included) & 4 * AA Batteries (Not Included) for Door Lock Unlock Current: 120mAh Battery Life: 4 batteries last for 16 months in standby mode Working Temperature: -10 to 60℃ Working Humidity: 20%-80% Lock Tongue Moving Distance: 22mm Material: Stainless Steel Item Size: 137 * 77 * 37mm / 5.39 * 3.03 * 1.45 inches Item Weight: 670g / 23.67oz Package Size: 23.0 * 17.0 * 6.5cm / 9.05 * 6.69 * 2.55 inches 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 Controllers 1 * English-Chinese User Manual