Features: TPA3251D2 is a high-performance class D power amplifier, which has class D efficiency and can bring true high-end sound quality.The device features advanced integrated feedback design and proprietary high-speed gate driver error correction function(PurePath™ Ultra high-definition). This technology allows the device to maintain ultra-low distortion throughout the audio frequency band while exhibiting perfect sound quality. This technology allows the device to maintain ultra-low distortion throughout the audio frequency band while exhibiting perfect sound quality. Using original TPA3251D2 power amplifier chip. Imported capacity 330UF/100Vx4 main filter electrolytic capacitors are used to ensure strong and continuous power support. Specifications: Material:Metal PCB Size:Approx.103x78MM/4.06x3.07in Working Voltage:DC 24-36V The total output power when the total harmonic distortion + noise (THD + N) is 10% 175W /4Ω, Bridge Tied Load (BTL) stereo configuration 220W /3Ω, bridge connected load (BTL) stereo configuration 350W /2Ω, Parallel Bridge Load (PBTL) mono configuration Total output power when THD + N is 1% 140W /4Ω, BTL stereo configuration 175W /3Ω, BTL stereo configuration 285W /2Ω, PBTL mono configuration Adopt advanced integrated feedback design with high-speed gate driver error correction function (PurePath Ultra high-definition) Package Includes: 1x TPA3251 Amplifier Board note: Please allow 1-2cm 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. Thank you!