Description:  All parts of this product are original authentic, unpretentious, pure quality; the use of high-quality original parts, not only the safety and quality are guaranteed, the service life is long, more important is to ensure that the actual performance can achieve the design goals. Pursuit of quality is our consistent aim.     Features:  1. Original 6J5 tube, original NE5532.  2. The main filter capacitor uses the original 470UF/25V, and the coupling capacitor uses the imported capacitor 1UF.  3. The resistor uses a high-precision chip resistor to ensure a good signal-to-noise ratio.  4. PCB uses 1.6mm thick double-sided sheet, 2.0 oz copper thickness, spray tin full process, to ensure good passing performance of large and small current. First-class PCB quality.  5. Input and output with gold-plated RCA seat, durable and beautiful 6. The board layout is reasonable, beautiful, and the current is small.     Basic parameters:  Power supply: DC12 V2A (DC).  Size: length 133* width 89* height 22MM (without tube height).     Package included:  1 x Bluetooth Tone Board