1Adopt GSM / 2G net communication, without any distance limitation, it can be used anywhere. 2850/900/1800/1900MHz quad-band GSM frequency, can work in global GSM network. 3Without call charges, the GSM GPRS relay switch rejects calls from authorized numbers and then performs an open / close operation on the first "ring". 4Wide working voltage, support DC 9 - 24V power supply, and with anti-reverse protection design. 5Using SMS to set parameters remotely, easy to operate and easy to use. 6Support 200 groups of numbers, each group of numbers can be set to control the relay within a specified period of time. 7One relay output, the authorized number will be closed after the incoming call, and it will be automatically opened after the set time. 8Add or delete users with SMS text commands, simple operation, convenient for using. 9After the authorized phone controls the relay, it can send action text messages to the user. 10Between 0-999 seconds, the relay closing time can be controlled arbitrarily, where 0 means: the relay will open 0.5 seconds after closing, and 999 means: the relay will remain closed until the permission number is dialed in. 11You can query the current status of the device (relay status and GSM signal value) through SMS instructions. 12You can upload the current status of the device to the first user by SMS in a timely manner. 13Use the clock on the module and send yourself a text message to synchronize after each boot. 14Metal case with IP30 protection. The metal housing is safely isolated from the system, which is especially suitable for industrial control field applications. 15Compact size, (L x W x H) 90 x 70 x 27mm/3.5 x 2.8 x 1.1in, simple installation, support wall mounting, no need complicated tools. 16Wide range of applications, suitable for garage access control, remote switching equipment, street lights, motors, inverters, remote pumps, LED signs, etc. Condition: 100% Item Type: GSM Gate OpenerMaterial: MetalColor: As picture shownSize(L x W x H): Approx. 90 x 70 x 27mm/3.5 x 2.8 x 1.1inWorking Voltage: DC 12V/1.5A, Range: 9-24VDCWorking Power Consumption: Standby: 12V/16mA; Working Maximum: 12V/150mAGsm Frequency: 850/900/1800/1900MHzSIM Card Interface: Support 3V SIM CardExternal Antenna: SMA Antenna Interface: 50 OhmRelay Output: 1 Relay Output, Rated Output 3A / 220V AC, 7A / 125V AC, 20A / 14V DCOperating Temperature Range: -10 - + 60 COperating Humidity Range: 95% Relative Humidity (non-condensing)Applications:Remote open/close swing/sliding gates, doors, shutters, garage doors,locks with a free call Residential: Door,gate,garage access control, electronic fan,microwave,air-conditioner control.Industry: Remote switch equipment, for example: street lights, solar power, motor, inverter, PLC, pumps, fans, etc.Agriculture: Remote control pumps, etc.Business: Remote control electronic boxes, bright billboards, LED signs, etc. 1 x Host Controller1 x GSM Antenna1 x Instruction