Other Smartphone Accessories -Pre Control Board Highlights Generic Brand Pre Control Board Description: The power supply circuit adopts the full bridge rectifier. Effectively eliminate high-frequency interference from the AC power grid. Chip has high conversion rate and strong driving ability. Better performance, the noise is very small. Warm and distorted sound, high fidelity. Specification: Material: PCB Board Color: As pictures shown Size: Approx. 11.2x 7x 2.3cm (Lx Wx H) / 4.41x 2.76x 0.91 inch Operating Voltage: AC 12V Tuning Type: Low/Middle/High Pitch/Volume Channel: Dual Channel Package includes: NE5532 Preamplifier Control Board 1 piece Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.