Features: 1.The RTU5024 GSM door opener is a powerful GSM relay, it is a very simple device that can be used for authorized door access, control doors, change of remote equipment, car parking systems. 2.The RTU5024 GSM relay switch can be used in places that require turning on/off your system(machines, remote equipment with a free call from your mobile phone) 3.This GSM gate opener features a remote on/off switch via free authorized phone calls, which can be operated from anywhere, without a distance limit, convenient for using. 4.850/900/1800/1900mhz quad-band, which can work in global GSM network. 5.The GSM relay switch answers the call from the authorized number and performs the on/off action, no call charges required. 6.Secure caller ID for identification, unknown calls are ignored. 7.Add or remove users using an SMS text command. 8.It is not necessary to provide a remote control or keys for different users. 9.Up to 200 authorized phone numbers can be set at the specified time. 10.The relay action will return an SMS confirmation to the owner or authorized call number, this function is editable by the user. 1 1.The closing or opening time of the relay is programmable. 1 2.Widely used, suitable for doors, bolsters, obstructions, garage doors, shutters and access doors or machines, etc. Specification: Condition: 100% Brand New_x000D_ Item Type: Door Access Controller_x000D_ Material: ABS_x000D_ Color: As picture shown_x000D_ Model: RTU5024_x000D_ GSM Frequency: 850/900/1800/1900 MHz_x000D_ Digital Output: NC/Dry Contactless, 3A / 240VAC_x000D_ Power Supply: AC 100-240V_x000D_ SIM Card: Standard SIM Card_x000D_ Antenna: 50 SMA Antenna Interface_x000D_ Temperature Range: -20-+ 60_x000D_ Humidity Range: 90% Relative Humidity_x000D_ Size: Approx. 106 x 88mm/4.2 x 3.5in PackageList: 1 x Door Access Controller1 x Antenna1 x Instruction