Features High Accuracy: The sound level meter uses intelligent air semiconductor sensors to test the temperature and humidity values in decibels, it is more sensitive, accurate, and stable. 30‑130dB Measurement range with ±1.5dB accuracy, 50Hz~8.5KHz frequency range. Simple Charging: This decibel meter comes with a built in 2000mAh lithium battery power supply and a 10ft long USB charging cable. You can place it anywhere you want and charge it anytime, anywhere. 3 in 1 Design: This large screen decibel meter has an LED display screen, adjustable brightness, and is equipped with a decibel meter. This means you will have a noise meter, thermometer, and humidity meter, providing convenience for your work and life. Easy to Operate: This intelligent decibel meter widely applicable and the brightness is adjustable. You can also press the M button to adjust detection speed. There are three gears of fast, medium, and slow. Wide Application: This noise monitor is an excellent tool for checking, monitoring, or controlling and testing any environmental sound level, and can be applied to noise engineering, product quality control, health prevention and treatment, and more. Specification: Item Type: Sound Level Meter Display: LED Screen Atmospheric Pressure: 12.5-15.4PSI Sampling Time: 1.5 Seconds Temperature Range: -10℃~50℃ Storage Temperature: -10℃~60C Relative Humidity: 20%-85% Humidity Range: 20%-85% Charging: 1000 mAh 5V Battery: 1 x 2000mAh rechargeable lithium ion battery, shipped with built in battery. Product Size: 10.6 x 3.5x 1.4in Decibel Unit: dBA Measuring Range: 30-130dBA Accuracy: ±1.5dBA Frequency Range: 50Hz-8.5kHz Frequency Weighting: A Resolution: 0.1 dBA Package List: 1 x Sound Level Meter 1 x User Manual 1 x USB Cable 1 x Installation Sticker 2 x Screw 2 x Wall Plug Package List 1 x Sound Level Meter 1 x User Manual 1 x USB Cable 1 x Installation Sticker 2 x Screw 2 x Wall Plug