☆ Temperature: -10 ~ 45 ℃ ☆ Relative humidity: 5% ~ 95% ☆ Power supply: 8.4V@1.2A ☆ Backup Battery: 1200mAH ☆ sensitivity: -112dbM ☆ alarm frequency: 315MHz ☆ GSM frequency bands: 900,1800MHz 1) Fully automatic operation, menu settings, convenient and quick. 2) gateway with up to 1200 detectors, can store up to 200 room information, cost-effective. 3) the police, after the first mass alarm phone call through the GSM network 4) arrears automatic reminder: the balance is less than 10 yuan a public phone SMS alert 5) open communication with the detector distance --250-360m 6) can query the alarm and Brown recorded 7) private phone messages settings: text formatting available dedicated private phone 8) can be incorporated into networking platform 9) applies to all personnel office buildings, hotels, restaurants, markets and other crowded places great