☆ Temperature: -10 ~ 45 ℃ ☆ Relative humidity: 5% ~ 95% ☆ Power supply: 9V @ 500mA ☆ Standby current: <70mA ☆ Alarm current: <200mA ☆ alarm frequency: 315MHz ☆ sensitivity: -112dbM ☆ GSM frequency bands: 900,1800MHz 1) gateway and the sensor of the alarm system 2) gateways and networking platform to build a primary alarm platform 3) With the GSM card call 4) strong voice alarm and automatically dial the preset phone numbers cycle 5) accurately alarm to 150 room number, can learn 900 detectors 6) is not leaving because of alarm settings, switch information is lost 7) ??open communication with the detector distance --250-360m 8) uninterrupted remote phones, gateways, three compound detector stereo alarm 9) can check alarm records