Feature 14 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. 211IN DISPLAY SCREEN: This large screen decibel meter has an 11 inch LED display with adjustable brightness for a clear, easy to use display. 3HIGH 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. 4WIDE APPLICATION: The sound level meter can be applied to noise engineering, product quality control, health prevention and treatment, etc. 5USB 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.SpecificationItem Type: Wall Mounted Sound Level MeterMaterial: ABSDisplay Method: LED ScreenAtmospheric Pressure: 12.5 PSI- 15.4 PSISampling Time: 0.3 SDetection Temperature Range: -10-50Storage Temperature: -10-60Operating 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 .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Wall Mounted Sound Level Meter1 x Instruction1 x USB Cable1 x Installation Sticker2 x Screw2 x Expansion Tube