Decibel Meter Wall Mounted High Accuracy Battery Level Indication USB 30?130dB with Alarm Function

Feature: 1. WALL MOUNTED DESIGN: The wall mounted decibel meter has mounting holes that allow it to be easily mounted on the wall without taking up space. 2. FUNCTION: It is an instrument used to measure environmental noise. It uses digital technology to accurately measure the strength and frequency of sound. 3. OPERATING 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. 4. CHARGE DISPLAY FUNCTION: Wall mounted decibel met