Pen Type Portable Gas Detector

Specfication:
Model No.: MTPG02
Detecting gas: Natural Gas, LPG etc. 
Range: 0-100%LEL
Sampling: Natural diffusion
Operating temperature: -20^oC-55^oC
Operating humidity: <95%RH
Operating voltage: DC3V (two 1.5V AA batteries)
Low alarm: (20 +/-5) %LEL
High alarm: (50 +/-10) %LEL
Response time: <5s
Alarm method: Visual and audible alarm
Sound: >=65dB