1. This GSM door opener is based on GSM network and can be widely used in doors, guardrails, shutters, parking systems, household appliances, computer rooms, greenhouses, remote equipment exchange, industrial remote control, etc. 2. 3G version, you can set the number and parameters through the serial port, and there is a supporting setting software. 3. Adopt the general GSM quad-band frequency design, suitable for the markets of various countries 4. The control of RTU5015 only needs to make a call or send a text message, the control is simple and easy to use 5. Material: ABS plastic 6. DC power supply: 12V/2A 7. Power consumption: 12V input (50mA) 8. SIM card: support 3V SIM card 9. Antenna: 50Ω SMA antenna interface 10. Temperature range: -20-60 degrees Celsius 11. Humidity range: 90% relative humidity (no condensation) 12. Relay rating: 3/240V AC