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 will 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 a 10ft USB charging cable, you can charge easily.         Specification: Item Type: LED Decibel Meter     Material: ABS     Display Method: LED Screen     Atmospheric Pressure: 12.5PSI to 15.4PSI     Sampling Time: 0.3S     Detection Temperature Range: 14& 8457; to 122& 8457;     Storage Temperature: 14& 8457; to 140& 8457;     Working Environment Storage Humidity: 20%-85%     Detection Humidity Range: 20% to 85% (Accuracy: 5%)     Charging: 1000mA 5V DC     Battery: 1 x 18650 2000mAh (Built in)     Unit: dBA     Measuring Range: 30-130 dBA     Accurate: ±1.5dBA     Frequency Range: 50Hz to 8.5kHz     Frequency Weighting: A     Screen Display: 0.1 dBA     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: & 8457;):     Green: 68-86     Orange: Below 68     Red: Above 86              Package List:     1 x LED Decibel Meter     2 x User Manual     1 x USB Cable     1 x Installation Sticker     2 x Screw     2 x Anchor