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. Item Type: VU Meter Set Material: ABS+PCB VU Meter: Maximum Current Sensitivity: 1mA ±10% Internal DC Impedance: 100Ω±10% Insulation Resistance: Above 50MΩ Friction: ±1mm / 0.04in Pointer Length: 70mm / 2.8in±1mm / 0.04in (from needle end to shaft center) Pointer Width: 0.45mm / 0.02in±0.05mm / 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 2 x VU Meter Head 1 x Driver Board 6 x Cable