1WALL MOUNTED DESIGN: The wall mounted decibel meter has mounting holes that allow it to be easily mounted on the wall without taking up space. 2FUNCTION: It is an instrument used to measure environmental noise. It uses digital technology to accurately measure the strength and frequency of sound. 3OPERATING PRINCIPLE: The microphone collects sound signals from the environment and converts them into electrical signals. an AD converter converts the electrical signals into digital signals, which are then transmitted to a digital signal processor for processing and analysis. The processor calculates the strength and frequency of the noise and displays the results on the screen. 4CHARGE DISPLAY FUNCTION: Wall mounted decibel meter has a built in battery and with a charge alert function, it is easy to remind charging and convenient to use. 5WIDELY USED: It can be used in home, office, club, college classroom, hotel rooms, hospital wards, hotels, laboratories and other places, or used in industrial noise monitoring, environmental noise assessment, building construction noise monitoring and other fields.