1、Compatibility: The controller uses GSM, 3G network communication, not limited by distance, and can be used anywhere. 2、Security: As long as you use a phone to call the mobile card number installed in the controller, it will determine the legitimacy of the incoming number and immediately hang up if an illegal number calls in. 3、Performance: Supports arbitrary control of relay closing time, the 0 means: relay closes for 0.5 seconds and then disconnects, 999 means: relay stays closed until the authority number is called in and then disconnects. 4、Specified Settings: Support authorizing someone to open the door only within a specific time period, after this time period it is impossible to open the door. 5、Advantages: Metal housing and system safety isolation, especially suitable for industrial control site applications, small size and support wall mounting. 6、Application: Widely used for industrial sites, home appliances, access control, dropper, valves, gates and other remote control sites. Item Type: Mobile Phone Access Controller Material: Metal GSM Frequency: Band 850/900/1800/1900MHz Power Consumption: 9-24VDC/2A SIM Card: Supports 3V SIM cards GSM Antenna: 50Ω SMA antenna port Operating Temperature: -20-+60°C Relative Humidity: 10-90% Size: Approx: 102 x 76 x 27mm / 4.01 x 3.0 x 1.06in 1 x Mobile Phone Access Controller 1 x Antenna 2 x Terminal 1 x Power Adapter 1 x User Manual