1. [WiFi Function] The device supports 2.4G WIFI, and can be connected with your mobile phone connects through wifi and for tuya APP. All data and historical data can be viewed from APP via mobile phone. 2. [4 in 1 Meter] With this meter, you get a noise meter, thermometer, hygrometer, and clock, which provides convenience for your work and life. Designed with 11 inch LED screen, the brightness is adjustable. 3. [High Accuracy] The sound level reader uses smart air semiconductor sensor to test the decibel, temperature and humidity value, which is more sensitive, accurate and stable. 4. [Adjustable Design] Not only can the screen brightness be adjusted, you can also adjust the speed of detection. Double click M key to adjust the time. 5. [Easy Charging] This decibel meter has a built in 2000mAh lithium battery power supply, and comes with USB charging cable, you can charge easily. Spec: Item Type: LED Decibel Meter Display Method: LED Screen Atmospheric Pressure: 12.5PSI to 15.4PSI Sampling Time: 0.3S Detection Temperature Range: 14℉ to 122℉ Storage Temperature: 14℉ to 140℉ Working Environment Storage Humidity: 10%-80% Detection Humidity Range: 20% to 85% (Accuracy: 5%) Charging: 1000mA 5V DC Battery: 1 x 18650 2000mAh (Built in) Unit: Measuring Range: 30-130 Accurate: ±1.5dBA Frequency Range: 50Hz to 8.5kHz Frequency Weighting: A Screen Display: 0.1 Noise Meter Level (Unit: dB): Green 1: 55.0 or less Green 2: 65.0 to 55.0 Orange 1: 75.0 to 65.0 Orange 2: 85.0 to 75.0 Red 1: 95.0 to 85.0 Red 2: Above 95.0 Grade of Temperature Smiling Face (Unit: ℉): Green: 68-86 Orange: Below 68 Red: Above 86 Material: ABS colour: White Package Contents: 2 x LED Decibel Meter 2 x USB Cable 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.