【Backlit Keyboard】The backlight makes it easy to see at night and easier to use. Use high-quality metal material, wear-resistant, high temperature resistant, with surface protection. Resistant to use. 【You need to access the control system】mainly for business; laboratories; factories; warehouses; apartments; building; corporate building; companies; banks; prisons; If you have any questions; please contact us via; we are at your disposal 【Latest microprocessor technology】 for door locking and security systems that require immediate (timed) closing. 8 assistance modes including: door ajar, door forced, shunt, door monitoring, normal/safe. 【Wide application】Works with electromagnetic locks, access control systems and controls other electrical or alarm devices. The device can be safely installed outdoors as it is weatherproof. 【Built-in memory】All device codes and settings are safely stored in a built-in memory. The device will not forget the saved settings and codes in the event of a power failure.