Features: 1.ID Card Access: Integrated structure lock is able to be quickly unlocked by an ID card, which is convenient and practical. 2.Built in Battery Terminal Cleaning Brush: With a battery terminal cleaning brush to save the trouble of cleaning the battery wiring and improve the battery life. 3.Silent Operation: Wiring free lock operates gently and silently so as not to disturb your family and neighbors. 4.Wireless Control: Electric lock eliminates wiring hassles and is able to be controlled and monitored remotely. 5.Anti Theft: The silent double head lock features an anti theft design for enhanced security to protect your property from theft. Specification: Item Type: Battery Lock_x000D_ Material: Stainless steel_x000D_ Size: Approx. 13x10x4cm/5.1x3.9x1.6in_x000D_ Battery Type: Button battery _x000D_ Battery Model: CR2025L_x000D_ Battery Capacity: 140mAh_x000D_ Lock Battery Type: AA Alkaline Dry Battery (shipped without battery)_x000D_ Lock Battery Type: AA_x000D_ Lock Battery Quantity: 4 PackageList: 3 xLock Bodies 3 xKeys 1 xIntelligentManagementCard 1 x Key Cylinder 2 xIDSensorCards 1 xScrewBag 1 xRemoteControl