gas leak alarm with battery back up

1.Conform to EN50194 standard
2.Battery back up
3.After power cut,the battery can use more than 10 hours.
4,Sound above 85DB

·Power: AC-DC adapter,9V battery backup
·Mounting: Accessories supplied for wall mounting.
·Alarm volume :  ≥85db@1M
·Alarm pattern: BI 0.5s--pause 0.5s repeat this pattern
·Operating Temperature : 0 ~ 50
·Ambient Humidity : 10%~ 90% RH
·Power Consumption : ≤4 W
·Detection gas type: LPG,NG(LNG),other flammable gas
·Alarm sensitivity :  10%LEL
·Output signal:   nature-open and nature close. 

after power cut,the battery can use more than 10 hours.
·Packing size :125mm x 110mm x 55mm         
·Weight:0.35kg