This product is full of materials, featuring high performance and high performance price, especially for HIFI music power amplifier with high power and high fidelity. TPA3116D2 is a type D amplifier IC launched by TI company, which has very high index parameters.The maximum modulation frequency is 1.2MHZ, and the high power output distortion is less than 0.1%. The red and gray ring inductors are specially designed for digital power amplifiers, featuring low loss, high bandwidth and high fidelity. The 684 film capacitor is a special capacitor for o amplifier, which has the characteristics of low loss, high bandwidth and high fidelity. With AUX and bluetooth two o source input mode, two in one.Potentiometer adjust volume, with switch, easy to control volume, very suitable for DIY speakers. Copper DC female , fence terminal, withstand large current, no heat, no damage to , good wiring, not easy to short circuit. 5.0 bluetooth version, higher transmission efficiency, longer transmission distance. Notes for use: the power switch on the board is standby switch, and the machine is in standby state with low power consumption after the switch is turned off. To completely turn off the power or to remove the DC plug on the machine for a long time, it is ok. colour:black Material:plastic size:84x52x24mm Package Contents: 1 x Amplifier board Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.