Introductions: CD Player: Two modes of CD playback and TF card(not included) playback are for you to choose. There are various modern functions. 5 types of sound effects: deep bass, JAZZ, popular, ROCK, ORIGINAL; 4 types of repeat functions: AB repeat and repeat once and repeat all and play in order. More Compatibility: Fully compatible with CD, CD-R, CD-RM, MP3, CD-DA, WMA formats. AUX is connected to the audio input of all 3.5mm audio devices, such as connecting speakers or headphones or car audio. This CD player provides you with more choices to enjoy your favorite music. Note: Please check if the disc is spinning. If your disc format is not compatible, it will not work..