The device will measure the body rhythm of the user, to help them "relax."
At their E3 Briefing today, Nintendo announced the Wii Vitality Sensor. The device attaches to the Wii Remote via the device port, and clips to the user's finger. It appears similar in form and function to pulse oximeters used in hospitals. Nintendo states that the device measures the pulse and “…a number of other signals being transmitted by [the user’s] bodies.” Nintendo President and CEO Satoru Iwata said the Vitality Sensor will provide users feedback about their “body’s inner working.”
No details were offered on how the device could be used for software. However, Iwata said that it could be a tool to help people relax and lower their heart rate. Nintendo offered no further details about the project, and it remains unclear what, if any, future plans they have for the Vitality Sensor.