TPA3251D2 power amplifier board, Lossless components, Multi-interface input. Gold-plated – Reliable contact and good shielding. The AP2202 is designed with audio amplifier chip TPA3251D2. TPA3251D2 is a high performance class-D power amplifier that enables true premium sound quality with class-D efficiency. Features an advanced integrated feedback design and proprietary high-speed gate driver error correction (PurePath™ Ultra-HD). This technology allows ultra low distortion across the audio band and superior audio quality. High Efficiency, Low Power Consumption, HD Audio Quality, and Comprehensive Protection Mechanism. One key bridging (Paralleled outputs). Color: black Material: PCB + components + metal NOTE: Restart after enabling PBTL mode. In PBTL mode, the default audio input is for the left channel, but it can also accept both left and right channels input simultaneously. The actual product may have slight color difference, which does not affect the use. Package Contents: 1 x Audio Power Amplifier Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is +/- 1-3 cm.