Kenwood has built what it claims is the world's smallest hard-disk music player.

The 10GB HD10GB7 "Media Keg" will only be available in Japan for the moment and measures just 44 millimeters by 62 mm by 17 mm. It weighs 78 grams and has a 1.5in OLED (organic light emitting diode) display on its front with a small keypad positioned directly under the display.

It plays MP3, wav and wma audio files including those with Windows Media DRM10 digital rights management so it can play tracks purchased on many Internet music stores.

Battery life for the player is 24 hours for MP3 files and 20 hours for Windows Media files, according to Kenwood. It can also display jpeg images and the user interface can be switched between Japanese, English, French, Italian, German, Dutch and Spanish.

It will go on sale in Japan in early December for around ¥40,000 (£175). Kenwood hasn't announced plans to put it on sale outside Japan.