1, high sensitivity, high stability, long life gas sensor 2, response recovery is fast, response time 30 seconds 3, large LCD display shows gas concentration and appliance status in real time 4, GSM / GPRS intranet alarm system, support multi-channel alarm, such as SMS, central internet, Wi-Fi, 007mlz, NB-LOT, etc., to ensure that the alarm is stable and reliable 5, support SMS, central remote control and settings 6, GPRS is online in real time to get the latest device operating status at any time 7, up to 5 predefined groups alarm calls, which can be set with its SMS switch respectively Quiescent current: less than 20mA Alarm current: less than 350mA GSM system: 850/900/1800/1900 MHz Operating temperature: 0 ℃ + 50 ℃ Relative Humidity: ≦ 95% rh Low voltage battery prompt: 3.9 +/- 0.3 V White colour Material: ABS Package contents: 1 * natural gas alarm device Only the contents of the above packaging, other products are not included. Note: Light shooting and different displays may cause the color of the item in the image to be slightly different from reality. The allowed measurement error is +/- 1-3 cm.