Usage Tips:Product name: Noise meter Power supply: usb charging Battery: Built-in battery Model: SLM-413 Type: Digital noise meter This professional-grade Wall-mounted/Desktop Noise Decibel Meter comes equipped with a large 13-inch color screen that provides clear,real-time decibel readings. Whether used in industrial settings, offices, or homes,this noise level tester helps monitor sound levels accurately to ensure compliance with safety regulations or maintain comfortable noise environments. With its versatile design,it can be used as a desktop device or mounted on the wall for permanent noise monitoring. Measuring range: 30 - 130 dB Colour:As Shown Material:ABS Package Contents: 1 * Noise meter 1 * usb charging cable 1 * pack wall nails 1 * positioning sticker Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.