1.Design for detecting LPG+Natural gas+artifical gas etc 2.Alarm level: 10%±5%LEL 3.Temperature Range:40℉-100℉(4℃-38℃). 4.Humidity Range:5%-95% relative humidity(RH) 5.Cordless or Wired Plug Optional, 6.MCU processing adopted. 7.malfunction auto-check indicator. 8.SMT manufacture technology,good stability. 9.Sensor :Adopt semiconductor sensor. 10.Operating voltage: 85-265V AC;9-volt alkaline backup battery,add 1.50USD.(Rechargeable Backup Battery,add 4.50USD). 11.Alarm output: Sound&Flash alarm; 12.Sound level: ≧85db (at 10ft). 13.rated power: 2.5W. 14.Be able to work with electromagnetic valve or exhaust fan. 15.execute criterion: EN50291,UL2034,EN50194. 16.Dimension: 118.5*82*43mm