Feature: Add or remove users via SMS text commands. Relay close or open time is programmable. Can be operated anywhere, no distance restrictions. Quad-band, compatible with global GSM networks. No need for remotes or buttons for different users. Safe – uses caller ID for identification; unknown callers are ignored. Up to 200 authorized phone numbers can be configured at a given time. One output with a relay rating of 3A/240VAC for connecting a door or machine switch. Suitable for multiple applications including doors, bollards, barriers, garage doors, shutters, access doors, and machines. The relay action sends an SMS confirmation to the owner or authorized phone number; this feature can be customized by the user. No call charges. The GSM GPRS trunk exchange rejects calls from unauthorized numbers and performs an open/close operation upon the first ring. GSM frequency: Quad-band 850/900/1800/1900MHz Network: 4G Output: NC/NO dry contact, 3A/250VAC DC power supply: 9-24VDC/2A Power consumption: 12V input, maximum 50mA / average 25mA SIM card: Supports 3V SIM card Antenna: 50Ω SMA antenna interface Temperature range: -20°C to 60°C Humidity range: Up to 90% relative humidity Size: Total length approximately 125mm Description: The GSM door opener is a powerful GSM relay designed for authorized access control, operating doors, switching remote devices, and managing parking systems. It can also be used in situations where a system, machine, or device needs to be turned on or off remotely using free calls from your cell phone. Type: G202 GSM Gate Door Opener Color: Black Material: ABS Package Contents: 1 x G202 GSM Door Opener Note: Other items not included. Note: Light reflection and differences in display screens may cause slight variations between the color of the item in the photo and the actual product. Measurement error allowed is +/- 1-3cm.