Feature:1. 4 IN 1 DECIBEL METER: This decibel meter has multiple functions, having a decibel meter is equivalent to having a thermometer, hygrometer and clock at the same time.2. 11IN DISPLAY SCREEN: This large screen decibel meter has an 11 inch LED display with adjustable brightness for a clear, easy to use display.3. HIGH ACCURACY: The sound level meter uses an intelligent air semiconductor sensor to test decibel temperature and humidity values, making it more sensitive, accurate and stable.4. WIDE APPLICATION: The sound level meter can be applied to noise engineering, product quality control, health prevention and treatment, etc.5. USB CHARGING: This decibel meter has a built in 2000mAh lithium battery power supply with a 10ft USB charging cable so you can charge it anywhere.Specification:Item Type: Wall Mounted Sound Level MeterMaterial: ABSDisplay Method: LED ScreenAtmospheric Pressure: 12.5 PSI- 15.4 PSISampling Time: 1.5 SDetection Temperature Range: -10℃-50℃Storage Temperature: -10℃-60℃Operating Environment, Storage Humidity: 20%-85%Detection Humidity Range: 20%-85% (Accuracy: 5%)Charging: 1000 mA 5V DCBattery : 1 x 18650 2000mAh (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: 65.0-55.0Orange1: 75.0-65.0Orange2: 85.0-75.0Red1: 95.0-85.0Red 2: 95.0 or moreTemperature Rating (unit ℃): Green: 20-30Orange: Below 20Red: Above 30.Package List:1 x Wall Mounted Sound Level Meter1 x Instruction1 x USB Cable1 x Installation Sticker2 x Screw2 x Expansion Tube