Usage Tips:This screen decibel meter has a 11 inch LED display with adjustable brightness, so you can read the real-time levels of decibels, time, temperature and humidity. [High Precision]: This sound level meter uses an intelligent air semiconductor sensor to test decibel temperature and humidity values. Compared with ordinary sensors, it is more , accurate and stable. The measurement range is 30~130dB, accuracy: 1.5dB, frequency response range: 50Hz~8.5KHz; Humidity range: 20~85%, accuracy: 5%; Temperature range: 14~122, accuracy: 5%. This noise monitor is a great tool for checking, monitoring or controlling and testing the sound level of any environment and can be applied to noise engineering, product quality control, health prevention and treatment, etc. This LED display decibel meter can be hung or placed on a table, making it an ideal noise meter for testing sound levels in classrooms, studios, major , factories, construction sites, homes, offices, etc. This intelligent decibel meter is to use, click "" to enhance the brightness, click "" to reduce the brightness, click "M" to adjust the detection speed, there are three gears: fast, medium and slow. Double-click "M" to adjust the time. This decibel meter built-in 2000mAh lithium battery power supply, comes with a 10 ft long USB cable charging, you can put it anywhere you to place it, charging anywhere, anytime. Material: ABS colour: As shown Package Contents: 1 x Decibel Meter 1 x charging cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.