---
name: "utwitch"
section: "4"
platform: "openbsd"
package: "man"
version: "8.0-current-20261101"
release: "OpenBSD 8.0-current (2026-11-01)"
platforms: ["openbsd"]
url: "https://new.carta.tech/utwitch"
---

# utwitch(4)

YUREX USB twitch/jiggle of knee sensor

## NAME

**utwitch** – YUREX USB twitch/jiggle of knee sensor

## SYNOPSIS

**utwitch\* at uhidev?**

## DESCRIPTION

The **utwitch** 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 [sysctl(8)](/sysctl/8.md) interface. 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).

## SEE ALSO

[intro(4)](/intro/4.md), [uhidev(4)](/uhidev/4.md), [sensorsd(8)](/sensorsd/8.md), [sysctl(8)](/sysctl/8.md) *The YUREX Web Page*, http://bbu.kayac.com/en/about/.

## HISTORY

The **utwitch** driver was originally named uyurex.

## AUTHORS

The **utwitch** driver was written by Yojiro UO ⟨*yuo@nui.org*⟩.