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This is a new wireless safety design gas leakage alarm detector that is fits and essential for every home and other places. It is an ideal item for protecting people from the danger of liquefied petroleum gas, natural gas, coal gas and methane. The device is a smart combustible gas detector with voice prompt, microprocessor control, support displaying of gas concentration. When the gas concentration is over 2500PPM, the gas detector will alarm and voice reminding: "attention please, gas leaking" . Hence it keeps your place safe from the threat of combustible gas. This system also can be used for other applications in the industry or plants that depend on LPG and natural gas in their operations. The system design consists of two main modules: the detection and transmission module, and the receiving module. The detection and transmitting module detects the change of gas concentration using a special sensing circuit built for this purpose. This module checks if a change in concentration of gas(es) has exceeded a certain pre-determined threshold. If the sensor detects a change in gas concentration, it activates and raises alarm of up to 85 decibel. KEY FEATURES Human voice prompt. High reliable catalytic combustion method. Gas concentration displaying(PPM). Power supply from AC 90V-240V or 9V rechargeable battery (Not included). Intelligent microprocessor control. Auto low battery warning. Alarm memory function. Auto detect sensor failure. SPECIFICATIONS: AV voltage: AV 90V-240V 50-60Hz Battery voltage: 9V rechargeable battery (Not included). Working temperature: 0-50°C Environment Humility: 10%-95% Alarm Density: 2500PPM(±1500PPM) Alarm Time: keep alarming after over 2500PPM Product Size: 112 * 73 * 42MM Material: Plastic PACKAGE INCLUDE 1 * Gas Detector (battery not included) 1 * Pack of Mounting Screws 1 * User Manual(English)