Hi-Res Sound Mode, 3D Surround Sound Mode, Stereo Sound Mode. Number of Loudspeaker Enclosure. This CD palyer is also a boombox player that can play music with multiple ways, which will meet your needs in different cases. (up to 32G, MP3/WMA/WAV format only); Cassette playing: put your tape in this cd cassette player, then start to listen the music.