1.High fidelity outside ring function 2.480 seconds Hi-Fi repetition 3.Large teaching machine function 4.MP3 /CD Description: 1,It is compatible with standard formats such as CD,CD-R,CDRW,HDCD,MP3Attention: The disc need to be installed in the computer cannot be compatible. Super vibration resistance:60 seconds for CD disc,120 seconds for MP3 disc. Support the play control system such as play, ...