Tokyo-based home electronics maker Kairen has announced it will start selling the Projector X Pro920M, an ultra-compact mini projector, in Japan in the middle of January 2009.

Weighing 190 grams, the projector measures 90×44×80mm. Kairen says it’s able to produce 25-inch images at a distance of 1m. Other specs include a brightness of 10 lumens, contrast ratio of 100:1, mono sound (1W) and a resolution of 640×480 (VGA).

As a special characteristic, the Pro920M can also be used for rear projection.

The projector is Japan-only at this point, but as Kairen seems to be a fairly internationalized company (by Japanese standards, at least), the $400 device might one day be exported.