brand:Unbranded Features: BY-08 Preamp tune board with treble, midrang, and, left-right channel balance and volume control. Dual AC 12V-15V power access, 5-way volume adjust, equipped with 2x 2200UF 35V filter capacitors. Selected components, and the 4558 op amp with high cost performance, high power, good sound quality, little distortion. Low noise, reasonable circuit board wiring and beautiful component layout, makes it great for enthusiasts DIY. With its excellent performance and comprehensive cost performance, it is widely used in home theater, HiFi audio speakers, etc. Specifications: Model: BY-08 Working Power: Double AC 12V-15V Material: Metal, Printed Circuit Board Size: Approx. 20X6.5 for cm/7.87X2.56 inch Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 Piece Preamplifier Board