1. Detecting Gas: Combustible gas, O2, CO and H2S
2. Calibration: Automatical calibration and zero-set
3. Sensor: Catalytic sensor for combustible gas and electrochemical sensor for O2, CO and H2S
4. Responding time: T90 < 30S
5. Alarm method: Flashing, wide-angled LED alarm light, LCD reading
6. Display: LCD displaying of gas reading, TWA, peak value when needed
7. Working Environment: -20 50 celsius degree < 90%RH no dews
8. Battery: 3.6V Li-ion chargeable battery, 200hours continuous operation
9. Explosive grade: EX ib II CT3