Micro chain with detachable speakers. It accepts the usb (64GB Lexar key recognized) but beware: no more than 99 directories with maximum 999 pieces per directory. on a full and well ranked 64GB, or forget to listen zaz william sheller ... It also accepts, bluetooth, ipod, cd, radio, and by the auxiliary input jack. I say to soundmachine detachable speakers, because the speakers can not be spaced from the base over 1.5m: are made directly from the welded inside the speakers, and the connector on the chain is special. not lengthen the son, then. the remote control is essential: off the mode buttons (radio, CD, USB ...), watch, play, stop, av; ret, and theft, no control buttons on the chain without the remote control. the sound is good (in domestic use, I have not installed auditorium!) the display shows the songs tags (usb), or time, or radio frequency, as desired. it also indicates the type of EQ (clear, warm ...). think about letting a magnifying glass next to the display. no sound adjustment (bass treeble-ball) outside the pre-programmed modes (clear, powerfull, warm, bright, balance) is frankly damage. The Shuffle has no memory: it can not be re-listen to what just passed by "previous". on the leaflet (Recommended card type) indicated that can be used to wake up. Well, I did that last night, but last night I can listen to music in the kitchen. perhaps one may expensive for soundmachine. One month after installation, I keep the same opinion with one caveat: the CD player is well poor, almost all my CDs (original trade) jump (read default), even new. 2 months after installation, I refer to warranty claims. Decidedly no CD is read correctly. Chain received after repair, the drive now works correctly. The final price is thereby increased costs of delivery, a little over thirty euros.