*Alarm mode: Automatically adjust sensitivity
*Self check: Self check every 24 hours
*Display mode: colorful ring light
*Ultra-low power consumption: battery long standby
*Alarm content: Over-concentration alarm, low battery voltage alarm
*Networking mode: NB-IoT
*Alarm mode: human voice alarm
*Alarm sound: greater than 85dB
*Working voltage: DC6V, 2*CR123Alithium battery
*Working current: ≤ 20 µA monitoring, ≤ 300mA alarm
*working environment: - 10℃ ～ 50℃，< 95%RH
*Dimensions:  φ 108*42.5mm