Feature:1. Simple installation, suitable for DIY, home audio, car audio transform, etc.2. 2 VU meters and 1 driver board, simple wiring, simple operation, easy installation for novices.3. One driver board can control two VUs and three potentiometers with a clear division of labor.4. Driver board can adjust the backlight brightness and the amplitude of the pointer swing.5. Backlight provides clear readings even in dim environments. Is a good helper for sound engineers.Specification:Item Type: VU MeterMaterial: ABS+PCBColor: As shown in the pictureSingle VU Meter Size: Approx.3.5x3.5x4.5cm/1.4x1.4x1.8inDriver Board Size: Approx.6x5x2.5cm/2.4x2x1inVU Meter:Maximum Current Sensitivity: 180uA10%Internal DC Impedance: 65010%Insulation Resistance: Above 50MFriction: 1mmPointer Length: 16.51mmPointer Width: 0.450.05mmMeter Installation Position: VerticalBacklight Board: 2.8-3.8V 20mA whiteDriver Board:Power Supply: AC/DC 12-16V 5WSignal Input: 0.775VBacklight Power Output: 1.25V-11V 50mA.Package List:2 x VU Meter1 x Driver Board6 x Flat CableNote:1. Please allow 1‑2in 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.