Features: Adopting TDA7498E chip, with excellent sound quality. It ensures that even with high power operation for a long for time. Uses BT 5.0, and its transmission distance can reach 49 feet (without obstruction). By adjusting the high and low frequency knobs, you can make the sound more layered and make the more shocking. Support reverse connection for protection, Over-voltage for protection, under-voltage for protection, Over-heat for protection, Short-circuit for protection. for Ideal for DIY speakers. Widely used in car, home theater etc. Package Includes: 1x Amplifier Board Specifications: Material: Metal Package size: approx 145x126x28mm/5.7x5.0x1.1in Chip: TDA7498E Input: AUX+BT+USB 2.1 Channel Power supply: DC15-36V 2.1 Channel note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.