Working voltage:AC90-240V Alarm sound pressure: equal 90dB Working temperature: -10 - +50(indoor temperature) Working atmospheric pressure range: 800hPa-1100hPa Alarm concentration: 8% LEL (+-3%) or 4000ppm (+-1500ppm) Working humidity: less than equal 95RH Gas detection: natural gas, , pipeline gas (The product continue to be upgraded, and the appearance and color may change. Please do not mind. If you have any requirements for color or appearance, you need to consider them before placing an order) Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on. Voltage:AC220V Color:White Material:Plastic Package Contents: 1 * Gas Alarm 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.