Feature:1. 11in LED Screen: This sound level meter has 4 in 1 function and 11in LED display, and is the sound meter, thermometer, hygrometer and clock 4 in 1. And is the great tool for checking, monitoring or controlling and testing any environmental sound level.2. WIFI and APP Function: This sound meter supports 2.4G WIFI and for Tuya and you can find the data in APP and make the phone connects to the device via wifi and for tuya APP.3. Semiconductor Sensor: Our LED decibel meter has smart air semiconductor sensor to test decibel temperature and humidity values and very accurate and sensitive.4. Brightness Adjustment: You can click up icon to enhance the decibel meter brightness, click down icon to reduce the brightness. There are three gears of detection speed, fast, medium speed and slow speed5. Battery and 10ft Charging Cable: Our LED sound meter is built in 2000mAh lithium battery power, with the 10ft USB charging cable and double click M to adjust the time.6. Wide Application: This sound level meter is suitable for classrooms, studios, major traffic arteries, factories, construction sites, homes, offices.Specification:Item Type: Sound Level MeterMaterial: ABSDisplay Method: LED ScreenAtmospheric Pressure: 12.5PSI-15.4PSISampling Time: 0.3SDetection Temperature Range: -10-and50, 1.0 accuracyStorage Temperature: -10 - 60Operating Environment Or Storage Humidity: 10 percent - 80 percent Detection Humidity Range: 20 percent - 85 percent (Accuracy: 5 percent )Charge: 1000mA 5VDCBattery: 1 X 18650 2000 MAh (Shipped With Built-In Battery)Unit: DBAMeasurement Range: 30 - 130dBAAccuracy: 1.5dBAFrequency Range: 50Hz-8.5kHzFrequency Weighting: AScreen Display: 0.1 DBASound Meter Level (Unit DB).Green 1: 55.0 Or LessGreen 2: 65.0-55.0Orange 1: 75.0-65.0Orange 2: 85.0-75.0Red1: 95.0-85.0Red 2: 95.0 Or MoreLevel Of Temperature Icons (Unit ).Green: 20-30Orange: Below 20Red: Above 30.Package List:1 x Sound Level Meter1 x Instruction Manual1 x USB Cable1 x Installation Sticker2 x Screws2 x Expansion Screws