Cassette mp3.

'Duo-air Digisette' is the term coined for this device, an mp3 player from the shape of a normal stereo cassette. Besides being a portable player, has the characteristic to listen to the songs downloaded from a PC, through a normal cassette deck, such as, for example, those present in many radio. It is equipped with nickel-cadmium batteries, has a capacity of 40 minutes of music and ventuo in the U.S. is $ 250.