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 Meter Material: ABS+PCB Color: As shown in the picture Single VU Meter Size: Approx.3.5x3.5x4.5cm/1.4x1.4x1.8in Driver Board Size: Approx.6x5x2.5cm/2.4x2x1in VU Meter: Maximum Current Sensitivity: 180uA±10% Internal DC Impedance: 650Ω±10% Insulation Resistance: Above 50MΩ Friction: ±1mm Pointer Length: 16.5±1mm Pointer Width: 0.45±0.05mm Meter Installation Position: Vertical Backlight Board: 2.8-3.8V 20mA white Driver Board: Power Supply: AC/DC 12-16V ≥5W Signal Input: ≤0.775V Backlight Power Output: 1.25V-11V 50mA . Package List: 2 x VU Meter1 x Driver Board6 x Flat Cable Note: 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.