Features: 1.Designed with display screen, it will display the concentration when the device detects a combustible gas leak after power on. 2.If there is a leak, the speaker will sound an alarm, and the indicator will show a red alarm, so you can deal with it in time. 3.There are two power supply methods, one is to install 9V battery (not include) or connect to AC90?240V power supply. 4.Easy to install, no complicated installation process, with instructions to help you use. 5.Made of high quality ABS fire engineering plastics, practical and durable for you to use. Specification: Item Type: Gas Leak Alarm_x000D_ Material: ABS_x000D_ Plug Voltage: 90-240V_x000D_ Power Supply Mode: Plug 90-240V Power Supply, 2PCS 9V Rechargeable Batteries (Battery Not Included)_x000D_ Detection Angle: 360_x000D_ Scope of Application: Detection of Leakage of Natural Gas, Liquefied Petroleum Gas, Artificial Gas, Etc._x000D_ Detection Distance: 10_x000D_ Working Temperature: 0-50_x000D_ Operating Instructions: The device can be powered by plugging in 90-240V voltage power supply or 2pcs 9V rechargeable batteries. After the device is powered on, when the device detects a flammable gas leak, the display will show the concentration, the speaker will sound an alarm, and the indicator will show red. PackageList: 1 x GasLeakAlarm 1 x Manual 1 x Screw Mounting Package