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Obviously, Japanese manufacturer Green House is trying to kill us. Why else would anyone bring out a mouse that uses only one finger? I guess if you're training for the finger Olympics, this could be of use, but other than that it actually sounds like a strange sort of torture. Japanese Finger Torture. That's what it is. Anyhow, if you'd like to drop $22 just to see how painful this could be, please do check out the Finger Mouse, which is only 2.5 cm wide with a rocker button to right and left click and a side-mounted scroll wheel. Comes in white, silver and black.

Japanese's One-Finger Mouse; RSI Casualties Soar [Everything USB]