uyurex —
YUREX USB twitch/jiggle of knee sensor
uyurex* at uhidev? reportid ?
The uyurex driver provides support for the Maywa-denki
  & KAYAC YUREX device. The device has a sensor to count user's leg twitch
  and it possesses a collection of sensor values which are made available
  through the envstat(8) command.
  The counter unit for twitch is "BBU" (BinBo-YUsuri or Bounding Body
  from Unconsciousness) and the unit for BBU speed is "mBBU/sec"
  (milli BBU per second).
The uyurex driver was written by Yojiro
  UO <yuo@nui.org>.