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.
This portable mp3/cd player is a good item for the price. It is on the smaller side so it fits well on a bedside table. The buttons are somewhat hard to push and often I have to push them several times to get what I want. The pause option turns the machine off way too quickly. If you want to pause something more than a few minutes this is not the option for you.
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