I connected this up to my speaker on my treadmill. The vibration was a problem with my previous player, and this has proven to be very stable during operation of the treadmill. I am extremely happy with it's ease of use and vibration damping.
Easy to use, very functional, and adaptable for different media types and connecting devices. Sound is not that rich, however we were not looking for a lot of bass (this was purchased for our kid). Very easy to figure out how to use and connect and mp3 player, phone, usb, etc.
I wanted this for outdoor use and I found the sound to be adequate for me, but if you like extremely loud music, it might not suit you. it has really great radio reception, and the cd player sounds good. I don't use mp3,usb,sd or mmc slot so I can not speak about them.
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