?Multifunctional?: This sound meter is equipped with a charging function, comes with a USB cable, and can operate for 8 hours on a single charge. It displays dB values, date or time, and features data recording capability with PC connectivity for data export, compatible with Windows 7, Windows 10, and Windows 11 ?Advanced Graphical Display and Alerts?: This decibel meter utilizes a combination of numerical and graphical display for clearer and more professional readings. It includes a three-color light alarm system, yellow (low alarm) and red (high alarm) lights, along with a triangular exclamation mark icon on the LCD screen ?Measurement Range and Accuracy?: The noise meter has a measurement range of 30~130 dB(A), 35~130 dB(C), with an accuracy of 1.5dB (reference sound pressure standard, 94dB@1KHz). It can store up to 3100 data records ?Calibration knob?:It features a calibration knob on the back, uses a Type-C interface for convenient connection, and automatically shuts down after 10 minutes of inactivity (adjustable) ?GAIN EXPRESS Sound Level Meter? is suitable for noise engineering, product quality control, and more. This audio noise measurement device is an excellent tool for inspecting, monitoring, controlling, and testing sound levels in any environment. It is widely applicable for personal, home, commercial, educational, and industrial use