Usage:Personal Name:Portable multi 4 gas monitor with explosion-proof for confined space Detecting gas:combustible gas, toxic gas, customize Measure Range:customize Gas sensor:Advanced sensor made in UK Sampling Method:Diffusion sampling standard / Sampling pump optional Alarm type:sound, light (4 LEDs), vibration Power supply:Rechargeable 3.7v lithium battery in 2200mAh Protection grade:IP66 Explosion-proof grade:Ex dibIICT4 & Ex ibIICT4 Dimensions:156mm*74mm*40mm Show More