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. Secure operation using 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, and access doors or machines. The relay action sends an SMS confirmation to the owner or authorized phone number; this feature can be enabled or disabled 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. 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 applications where a system, machine, or device needs to be turned on or off remotely using free calls from a mobile phone. Type: G202 GSM Gate Door Opener. Color: Black. Material: ABS. Package Contents: 1 x G202 GSM Door Opener. Only the above package content is included; other products are not included. Note: Light reflection and different display settings may cause the color of the item in the picture to appear slightly different from the actual product. Measurement allowance is +/- 1-3cm.