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 SetMaterial: ABS+PCBVU Meter:Maximum Current Sensitivity: 1mA ±10%Internal DC Impedance: 100Ω±10%Insulation Resistance: Above 50MΩFriction: ±1mm / 0.04inPointer Length: 70mm / 2.8in±1mm / 0.04in (from needle end to shaft center)Pointer Width: 0.45mm / 0.02in±0.05mm / 0.002inMeter Installation: VerticalBacklight: Blue Backlight Board 3-3.2V 80mASize: Approx. 137x95mm / 5.4x3.7inDriver Board:Power Supply: AC/DC 12-16V ≥5WSignal Input: ≤0.775VBacklight Power Output: 1.25V-11V 50mASize: Approx. 74x50mm / 2.9x2.0in.Package List:2 x VU Meter Head1 x Driver Board6 x CableNote:1. Please allow 0‑1 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.