Portable gas alarm is a Firefighting Supplies product. Key specs — Origin: China; Price Term: FOB.
Product Description
Features
* MCU control
* Portable type
* Imported sensor
* Good design
Details: 
* Gas detected: combustible gas, O2 and toxic gas etc. ( Optional )
* Accuracy: ±5% F.S.
* Response time: T<30s
* Indication: LCD indicates the time and state, alarming, malfunction and low voltage with LBD, sound, vibration
* Working Environment
nbsp; Combustible Tem: -40°C~70°C
nbsp; Toxic gas Tem.: -20°C~50°C
nbsp; Humidity: <90%RH No Con.  
* Working voltage: DC3.6V Li battery: 1200mAh
* Charging time: 4h~6h
* Working time: Combustible gas: < 8h continuously 
nbsp; Toxic gas: <300h continuously
* Life of sensor: 2 years
* Protection grade: IP65
* Weight: Appx. 670g
* Dimension: 110mm×60mm×40mm
If interested, please contact us, we will supply good portable CO detector with high quality to you. thanks.