Feature:   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.   11. The closing or opening time of the relay is programmable.   12. Widely used, suitable for doors, bolsters, obstructions, garage doors, shutters and access doors or machines, etc.   Specification:   Condition: 100% Brand New   Item Type: Door Access Controller   Material: ABS   Color: As picture shown   Model: RTU5024   GSM Frequency: 850/900/1800/1900 MHz   Digital Output: NC/Dry Contactless, 3A / 240VAC   Power Supply: AC 100-240V   SIM Card: Standard SIM Card   Antenna: 50&; SMA Antenna Interface   Temperature Range: -20-+ 60   Humidity Range: 90% Relative Humidity   Size: Approx. 106 x 88mm/4.2 x 3.5in   Package List:   1 x Door Access Controller   1 x Antenna   1 x Instruction