Feature 13 In 1 Multifunctional: This decibel meter is 3 in 1 multifunctional with noise meter, thermometer, and hygrometer, providing convenience for your work and life. 2High Accuracy: This decibel meter uses smart air semiconductor sensors to test decibel temperature and humidity values, which is more sensitive, accurate and stable. 3Wide Application: This decibel meter has a wide range of applications and can be used in classrooms, studios, major transportation arteries, factories, construction sites, homes, offices and more. 4Built In 2000mAh Lithium Battery: This decibel meter has a built in 2000mAh lithium battery and comes with a 10 foot USB charging cable, so you can put it anywhere you want and charge it on the go. 5Excellent ABS Material: This decibel meter is made of excellent ABS material, which is sturdy and wear resistant, not easy to be damaged, and has a long service life.Item Type: 3 In 1 Decibel MeterMaterial: ABSDisplay: LED DisplayAir Pressure: 12.5PSI-15.4PSISampling Time: 1.5 SecondsTemperature Range: 14-140Storage Temperature: 14-140Relative Humidity: 20%-85%Humidity Range: 20%-85%Charging: 1000 mAh 5VBattery: Rechargeable Lithium Battery 2000mAh x 1 ( Shipped With Built In Battery )Size: Approx. 10.6 x 3.5 x 1.4in/26.92 x 8.89 x 3.56cmConcentration Unit Decibel: dBMeasurement Range: 30-130dBAccuracy: 1.5dBFrequency Range: 50Hz-8.5kHzFrequency Weighting: AResolution: 0.1dB .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 3 In 1 Decibel Meter1 x Manual1 x USB Cable1 x Installation Sticker2 x Screws2 x Expansion Tube