[Charge-Friendly]: 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 want to place it, charging anywhere, anytime. If there is any problem, please contact us in time, we deal with you as soon as possible [4 IN 1 Multi-function + Large 11 '' LED Display]This large screen decibel meter has a 11'' LED display with adjustable brightness, and have a Diemmern Decibel Meter, which means you have a noise meter+thermometer+hygrometer+clock, provide convenience for your work and life. [High ]: This sound level meter uses an intelligent air semiconductor sensor to test decibel temperature and humidity values. Compared with ordinary sensors, it is more sensitive, accurate and stable. The measurement range is 30~130dB, accuracy: ±1.5dB, frequency response range: 50Hz~8.5KHz [Wide Application]: 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 : US(), Weight: 1.47268791016 Pounds, Manufacturer: NONDK