This is a WiFi+RF433 transmission gas alarm, When the alarm detects that the gas in the surrounding environment reaches 30% alarm concentration, the alarm will trigger the following reactions according to the model: send out alarm sound,send alarm code wirelessly, solenoid valve and push alarm information remotely by APP.When the gas concentration in the surrounding environment recovers, the 0% alarm will stop alarming and automatically return to normal monitoringOperating voltage: DC 5V (USB) , Power supply, not chargingAlarm volume: 90dBAlarm setting: 30ppmInstallation : wall-mounted/ceiling-mountedWorking temperature: -10 ~ + 50 Radio frequency: 433.92 MHzWiFi: IEEE 802.11 b/g 2.4 GHzDetection gases: natural gas, biogas, and methaneSupport 433MHz. support wireless solenoid valvesWeight: 150gModel Number: - platform: ,Tuya,Google AssistantModel Name: Gas Leak DetectorProduct Name: Gas Leakage SensorAPP: Tuya APPCommunication technology: WIFIFeature 1: Natural Gas Leak Detector SensorFeature 2: DetectorVoltage: AC100-250Vcolor:As shownMaterial:plasticPackage Contents:1 x Tuya WiFi Natural Gas Leak DetectorOnly the above package content, other products are not included.Note: Light reflection 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.