Feature: 1. 2 VU meters and 1 driver board, no need to worry about finding suitable drivers and wiring problems. 2. Simple combination wiring, suitable for DIY, home audio, recording studio, car audio conversion, etc. 3. 1 driver board can control 2 VU meters and 3 potentiometers with a clear division of labor. 4. It can adjust the brightness of the backlight and the amplitude of the pointer swing. 5. With blue backlight function, the reading is clear and accurate, and long service life. Specification: Item Type: VU Meter Set Material: ABS+PCB VU Meter: Maximum Current Sensitivity: 1mA 10% Internal DC Impedance: 10010% Insulation Resistance: Above 50M Friction: 1mm / 0.04in Pointer Length: 70mm / 2.8in1mm / 0.04in (from needle end to shaft center) Pointer Width: 0.45mm / 0.02in0.05mm / 0.002in Meter Installation: Vertical Backlight: Blue Backlight Board 3-3.2V 80mA Size: Approx. 137x95mm / 5.4x3.7in Driver Board: Power Supply: AC/DC 12-16V 5W Signal Input: 0.775V Backlight Power Output: 1.25V-11V 50mA Size: Approx. 74x50mm / 2.9x2.0in. Package List: 2 x VU Meter Head1 x Driver Board6 x Cable Note: 1. Please allow 01 inch error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.