This product is a WlFl smart alarm, which is a compound alarm composed of a catalytic combustion type gas sensor(C3H8, CH4, LPG) and an electrochemical carbon monoxide sensor(CO). can be used to detect the concentration and leakage ofvarious combustible gases like, natural gas,LPG gas,coal gas,methane, propane as well as carbon monoxide. The alarm adopts advanced design process. With its stability,reliability, quickresponse,beautiful appearance, and smartAPP, it is suitable for a variety of applications such as homes,warehouses,hotels,companies, schools, hospitals,restaurants, etc. could monitor the gas and carbonmonoxide level in these places, when the gas leak is detected it would flash sound locally and send alarm notification to your app immediately. Power supply: 110-240VAC Power:Less than 0.5w Warm-up time: after plug-in Standby: blue led once every 30s Working temperature:-10--60 Working Humidity:0%--99%RH Natural gas warninglevel:1500PPM-3500PPM Natural gas alarm level:3500PPM-10000PPM Co gas warning level:30PPM-180PPM Co gas alarm level: 180PPM-450PPM APP detection interval: 3s/second Horn level: 90db Red led: alarm Blue led: standby/warm-up led: Pairing state Voltage:AC220V Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on Colour:White Material:plastic Package Contents: 1 x Combustible Leakage Alarm Sensor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.