Smaller than a travel alarm clock, the new Yes YMP928 can rock your world like no other digital audio player. The device is the world's smallest 'boom box', with built-in stereo speakers that deliver three-dimensional sound and five-user equalisation modes to adjust the timbre. It has 512 megabytes of storage capacity, weighs 56 grams and measures 65 x 37.6 x 18.3mm. Digital audio formats supported include MP3, Windows Media Audio and Ogg Vorbis. It also supports mpeg-4 playback and shows jpeg files on its small liquid-crystal display. A lithium polymer battery delivers 16 hours of audio and eight hours of video playback on one charge. It also has a built-in FM radio. Available in red, green and silver, the South Korean-made YMP928 costs $1,338.