Mp3 cassette player
NVDRS Tape — is an Mp3 player which looks like an oldshool tape cassette. The player continues to follow the 45/60/90 minutes norm or 10/15/20 select songs in digital format. Songs are uploaded via USB.
But the most interesting thing about this palayer – it works on kinetic energy – to charge the batteries you should rotate the spools!
More info about this concept at yankodesign.
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Now, a days Mp3 cassette players are so much famous in market and the above mentioned is a nice one too..