Thinnest MP4 player which is an invision of Chinavision is at the second place to be the worlds thinnest at just 4.5mm of thickness. It’s true, less than half a cm in length if you take out your ruler. Though there is no information on its weight, which I think not be too much, then 4GB CVSJ 1304 and having a touch screen of 1.8 inch that increases a resolution up to 160 x 128 and supports a media formats in range of MP4, MP3, WMA, ASF, and WAV. Other important features which also include FM tuner, with rechargeable battery support long time backup and USB connectivity for minimum risk data transfer. It’s already on sale for just $39.95, which is around about 20 quid.