☆ Temperature: -10 ~ 50 ℃ ☆ Alarm concentration: Gas: 0.1 to 0.5 percent of natural gas: 0.1 ~ 0.3%; LPG: 0.1 ~ 0.2% ☆ Working power: 100mA ☆ Alarm volume:> 85dbA ☆ transmit power: ≥7dbM ① low power consumption, long life ② senses liquefied natural gas ③ intelligent control, to prevent false alarms, reliable electricity ④ ⑥ 2-3 minute warm-up self-test transmission power, supporting the use of gateways with Fire