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, close 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 monitoring Operating voltage: DC 5V (USB) , Power supply, not charging Alarm volume: 90dB Alarm setting: 30ppm Installation : wall-mounted/ceiling-mounted Working temperature: -10 ~ + 50 Radio frequency: 433.92 MHz WiFi: IEEE 802.11 b/g 2.4 GHz Detection gases: natural gas, biogas, and methane Support 433MHz. support wireless solenoid valves Weight: 150g Model Number: - Smart home platform: Alexa,Tuya, Assistant Model Name: Gas Leak Detector Product Name: Gas Leakage Sensor APP: Tuya APP Communication technology: WIFI Feature 1: Natural Gas Leak Detector Sensor Feature 2: Detector Voltage: AC100-250V color:As shown Material:plastic Package Contents: 1 x Tuya WiFi Natural Gas Leak Detector Only 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.