The Tuya Smart WiFi Gas Sensor is a wireless Wi-Fi enabled natural gas leak detector that informs you of the danger with both a siren and a mobile phone alert. This device will help you monitor the situation where there may be a leak - in the kitchen, basement or boiler room - even if you are outside your own home. It is mains powered and does not require a battery change. Designed for wall mounting. Characteristics: Operating voltage: 85-250V AC Detected gas: Natural gas (CH4) Sound level alarm: 70 dB Wireless type: Wi-Fi Colour: White