USB-MP3-Pen – The 512 MB USB MP3 Pen includes an MP3 Player, FM radio, and a voice recorder and also functions as shockproof and moisture-proof mass storage device.
It includes a 240 mAh Li-Ion battery, is 148×18 mm in size, weighs 50 g, and costs $48.00.
More information on the USB-MP3-PEN can be found here.