Item Type: 3 In 1 Decibel Meter <br>Material: ABS <br>Display: LED Display <br>Air Pressure: 12.5PSI-15.4PSI <br>Sampling Time: 1.5 Seconds <br>Temperature Range: 14℉-140℉ <br>Storage Temperature: 14℉-140℉ <br>Relative Humidity: 20%-85% <br>Humidity Range: 20%-85% <br>Charging: 1000 mAh 5V <br>Battery: Rechargeable Lithium Battery 2000mAh x 1 ( Shipped With Built In Battery ) <br>Size: Approx. 10.6 x 3.5 x 1.4in/26.92 x 8.89 x 3.56cm <br>Concentration Unit Decibel: dB <br>Measurement Range: 30-130dB <br>Accuracy: ±1.5dB <br>Frequency Range: 50Hz-8.5kHz <br>Frequency Weighting: A <br>Resolution: 0.1dB<br>1、3 In 1 Multifunctional: This decibel meter is 3 in 1 multifunctional with noise meter, thermometer, and hygrometer, providing convenience for your work and life. <br>2、High Accuracy: This decibel meter uses smart air semiconductor sensors to test decibel temperature and humidity values, which is more sensitive, accurate and stable. <br>3、Wide 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. <br>4、Built 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. <br>5、Excellent 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.<p>1 x 3 In 1 Decibel Meter</p><p>1 x Manual</p><p>1 x USB Cable</p><p>1 x Installation Sticker</p><p>2 x Screws</p><p>2 x Expansion Tube</p>