Human voice prompt. High reliable catalytic combustion. 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. AC voltage: 90V-240V 50-60Hz Battery voltage: 9V rechargeable battery (Not included) Working temperature: 0-50°C Environment humidity: 10%-95% Alarm concentration: 2500PPM (±1500PPM) Alarm time: Continuous alarm when gas concentration exceeds 2500PPM NOTICE: The gas detector is sensitive to strong impact or shock during transit or installation, which may cause malfunction. This is a combustible gas detector and cannot detect toxic gases such as carbon monoxide (CO). Scheduled maintenance: Clean the surface monthly and have a professional inspection every six months. Do not use detergent to clean the gas detector as it may cause damage. Avoid spraying air fresheners, hair sprays, or similar products near the device. This product is designed to help reduce the risk of accidents but cannot guarantee prevention in all situations. Always remain vigilant and maintain strong safety awareness. Plug Type: EU Plug, suitable for use in Indonesia, Germany, France, Italy, and other compatible regions. Color: White Material: Plastic Package Contents: 1 x Gas Detector Note: Other items not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error allowed is +/- 1-3cm.