Multi Gas Monitor Handheld Gas Detector 4 in 1 Gas Analyzer AS8900

Specification: Material: ABS Color: Yellow Size: 120*64.5*37mm 4 in 1 gas analyzer: Oxygen(0-30% VOL) / Carbon Monoxide(0-999 PPM) / Hydrothion(0-500 PPM) / Combustible Gas(0-100% LEL) Operating temperature: -10~40 Operating humidity: 0~95%RH Alarm: Sound, Light Alarm. Adjustable Alarm values(Alarm sound up to 80 db) Power by: 1*3.7V li-battery (Built-in) Package Included: 1 X AS8900 4 in 1 muilt gases monitor 1 X 3.7V rechargable lithium battery 1 X Charging adaptor(220v, US Plug) 1 X User manual