Human voice instruction. High reliability catalytic combustion . Gas concentration display (PPM). Power supply AC 90V-240V or 9V rechargeable battery (Not included). Intelligent microprocessor control. Automatic low battery warning. Alarm memory function. Auto detect sensor failure. AV voltage: AV 9V 9V-240V 50-60Hz Battery voltage: 9V rechargeable battery Operating temperature: 0-50 degree Environment: 10% -95% Alarm density: 2500PPM (plusmn1500PPM) Alarm time: keep the alarm after more than 25,000 ppm Product size: 112 x 73 x 42mm / 4.0 x 2.8 x 1.6in Product weight: 161g / 5.69oz Plug Type:EU Plug,it applies to Indonesia, Germany, France, , Italy and so on Colour: white Material: plastic Package Contents: 1 x Gas Detector 1 x English manual Notice: The gas detector is easy to carry out by sharp shocks in transit or installation, which does not work. This is a Combustible Gas Detector, it cannot detect poisonous gas like CO. Scheduled maintenance: cleaning of surfaces per month, inspection for half a year. Do not use the detergent to clean the gas detector, this will damage the gas detector. Do not spray sprays such as air fresheners, hair sprays, etc. This product is only used to reduce the accident, it cannot be insured every time. Except to use our detector correctly, the pleasure pays more attention in your and strengthens safety and security awareness. Only the above package content, other products are not included. Note: Light 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.