The product(SR-X908DSZ) is a smart carbon monoxide and combustible gas combo detector with voice prompt, insert  the voice chip, microprocessor control, supports displaying of the gas concentration. This product is used to  detect both the toxic carbon monoxide gas and combustible gas (such as liquefied petroleum gas, natural  gas, CH4(methane), etc). When trigger the detector, it will alarm with build-in siren. This detector adopts  catalytic combustion method sensor and electrochemical sensor which is stable and reliable.

Main feature
1.Human voice prompt
2.High reliable catalytic combustion method
3.Gas concentration displaying(PPM) 
4.Power supply from AC 90V-240V or 9V rechargeable battery
5.Intelligent microprocessor control
6.Auto low battery warning
7.Alarm memory function
8.Auto detect sensor failure

Technical Specification
Model No.    SR-X908DSZ
Material:    ABS Plastic
AV voltage:    AC 90V-240V
Battery voltage:    9V rechargeable battery(optional)
Warm-up Time:    About 180S
Working temperature:    0°C-50°C
Environment Humility:    10%-95%
Sound Level:    85dB/m
Alarm Output:    Red light flash, human voice prompt& alarm
Carbon monoxide gas:    100PPM~999PPM (±50PPM)
Combustible gas:    6%~20% LEL(3,000PPM~10, 000PPM±1, 500PPM)
Alarm:    vocal alert and siren alarm
size:    112*73*42mm