* High Reliability dual sensor design * Sensor: electrochemical CO sensor;Catalytic LPG/Gas sensor * MCU processing adopted,SMT adopted,good stability * SMT manufacture technologyTechnical parameters: * Type:independent * Operating voltage: 100-240V AC,50-60 Hz,2.5W, 9V rechargeable Ni-Mh backup battery (not included in the package, should be bought separately); * Working Environment:-10°C~+50°C(≤95%RH No Congelation) * Humidity range:10%-95% relative humidity(RH) * Alarm level: CO: 150PPM±50PPM, Gas: 0.25%(5% LEL) * Alarm output: Sound & Flash alarm * Sound level:85dB/3m * Concentration display:digital LCD * LCD Display:presents battery level;presents CO/GAS alarm level;CO:>40ppm * beginning to show;Gas:>0.1% beginning to show * Installation:Wall mounted; * Gas species:natural gas/CO or LPG/Gas * Execute criterion: * Dimension: 4.7x3.2x1.7 inchesPackage Include: 1* Gas Leakage CO Carbon Monoxide Detector with screws (No battery included in the package. If you need a backup battery, we suggest you to buy a 9V rechargeable Ni-Mh battery)