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 Material: Stainless steel Size: Approx. 13x10x4cm/5.1x3.9x1.6in Battery Type: Button battery  Battery Model: CR2025L Battery Capacity: 140mAh Lock Battery Type: AA Alkaline Dry Battery (shipped without battery) Lock Battery Type: AA Lock Battery Quantity: 4 Package List 3 x Lock Bodies3 x Keys1 x Intelligent Management Card 1 x Key Cylinder2 x ID Sensor Cards1 x Screw Bag 1 x Remote Control   Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.