... detect coal gas,natural gas and pettroleum gas ,LPG Wireless gas leakage sensor Work with burglar alarm system,Can detect coal gas,natural gas and pettroleum gas ,LPG ... of gas:coal gas,natural gas and pettroleum gas Alarm density:0.1% to 0.5%(coal gas ,petroleum gas) 0.1% to 0.3%(natural gas ) ... 0.1% to 0.5%(liquefied petroleum gas)Coding Type: ...