Features: Adopt 2G network communication, not limited by the distance. Adopt metal shell, protection class IP30. Metal case and system safety isolation, especially suitable for industrial control field applications. Built-in rechargeable backup battery to ensure work normally even the power outages. Small and compact, support wall installation. Adopt SMS remote setting parameters, easy to operate and use. Support 999 sets of numbers, each set of numbers can be set in the specified period of time to control the relay. One-way relay output, authorized number call-in or SMS or monitoring center can control the output After the authority telephone controls the relay, can send the action short message to the user. A USB communication port, support user-friendly configuration software to set parameters and read history. It has at least 1000 historical records of control and alarm, and its responsibility is clearly documented. Specification: Condition: 100% Brand New Material: Metal Case Color: As Picture Shown Type: Door Opener Model: RTU5025 Power Consumption: Standby: 12V/16mA, Maximum: 12V/150mA GSM Frequency: 850/900/1800/1900 MHz SIM Card: Support 3V SIM Card External Antenna: 50Q SMA Antenna Interface Temperature range:-10 ~ +60℃ Humidity: Relative Humidity 95% (no condensation) Application: Doors, elevators, garages, parking lots, resorts, control rooms, warehouses, unattended computer room, field optical eparation cabinet, field base station, traffic controller chassis, distribution system engine room and field cabinet Package Size: 8.5 x 15.5 x 5.5cm/3.3 x 6.1 x 2.2in Package Weight: Approx. 388g/13.7oz Package List: 1 x Access Controller 1 x Extension Antenna 1 x USB Cable 1 x Power Adapter 1 x English Manual Note: 1. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. .2. Please note that this product only supports 2G networks and cannot be used in some countries that have disabled 2G, and make sure you will not mind before ordering. 3. It does not apply to Russia, Belarus, Cuba, Iran, North Korea, Syria or Crimea.