AD-99D is a special Class A Hi-Fi integrated amplifier which supports 128G USB disk, TF card and lossless audio formats including WAV, FLAC, APE, etc. It also supports treble-bass independent adjustment, subwoofer output and original App control. As a top 10 audio brand in China, Tonewinner has 30+ years experience in designing and manufacturing acoustic products. As an original supplier, Tonewinner always warmly welcomes distributors, partners and customers around the world.