Japan's Sony Corp. plans to sell a smaller and lighter PlayStation Portable handheld game machine later this year, according to video game websites which cite what they say is Sony's own promotional video clip.

The video clip, which game websites including IGN say was first distributed through Sony's online game information distribution service for paying US subscribers, has been posted on YouTube.

The new device, dubbed the PSP Go, is 43 per cent lighter than the current model and comes with a 3.8-inch display, compared with a 4.3-inch screen now, according to the video clip on YouTube.

A spokesman for Sony's game unit, Sony Computer Entertainment declined to comment on the video clip, saying that any announcement on the PSP will be made at the E3 video game trade show that starts today in Los Angeles.

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