Description: 4 unlocking methods 1. Metal key 2. Password 3. Ekey(Electronic key) 4. Wifi & internet remote control Wifi & mobile internet remote control Two lock management software One for individual users Another for apartment,condo, hotel, users Android version,Apple(IOS) version, Web version three versions of management software One smart app can manage all the locks in the entire area, such as the entire house, entire office building or entire school. Specification: Material: Zinc Alloy Standards:Bluetooth 4.0 and above Power Requirement: 4 AA Alkaline Batteries Password length: 8 digits (randam) Card type: 13.56Mhz IC card Suitable Door thickness: 38-60mm/1.5x2.4 inch Working voltage: 4.8-6.5v Unlocking time: <1.5s Size:approx. 24x20x12cm/9.5x7.9x4.7 inch Package Includes: 1xSmart Bluetooth Code Lock Note: 1. Color might be slightly different due to the color calibration of each individual monitor. 2. Please allow the tiny measuring deviation due to manual measurement.