Feature: 1. Working Range: The measuring range of this noise meter is 30‑130dB, with an accuracy of ±1.5dB (reference sound pressure, 94dB at 1KHz), with 31.5Hz‑8.5KHz frequency response. 2. LCD Display Screen: The noise measuring meter adopts a 9.6 inch LCD display large screen with backlight, 3 digits white digital display, which is clear and intuitive. 3. Power Supply Method: This digital noise meter has built in 3600mAh lithium battery, with DC5V 1A USB interface, making it convenient to use anytime, anywhere. 4. Wall Mounted Design: This sound level meter is wall mounting design, and can be easily installed and fixed, which is stable and reliable, can greatly save indoor space. 5. Applicable Scenes: This decibel meter can measure the noise in scenes such as factories, offices, residences, transportation equipment, and audio equipment, etc. Specification: Item Type: Decibel Meter Material: ABS Battery Type: Lithium Battery (Built in) Battery Capacity: 3600mAh Power Supply: DC5V 1A Type C USB Interface Measurement Range: 30-130dB Accuracy: ±1.5dB (Reference Sound Pressure Level, 94dB at 1KHz) Frequency Response: 31.5Hz-8.5KHz Frequency Weighting: A Weighting Response Time: FAST Microphone: 6mm Condenser Microphone Digital Display: 3 Digits Resolution: 0.1dB (100dB) Operating Temperature: 0-40℃, 10%-80%RH Operating Humidity: -10-60℃, 10%-70%RH. Package List: 1 x Meter 1 x Data Cable 1 x User Manual Note: Power On: Press the ON Off buttonTurn Off: Press and hold the ON Off buttonAutomatic Start Function: The product will automatically turn on when connected to the power supply, long press the ON Off button, if the number on the LCD screen does not jump, or garbled characters appear, you need to restart it.