Jawbone UP - Track Everything Band
From: Popular Science - 12/2011 - page 77

The UP squeezes a battery, two LEDs, an accelerometer, a processor, a
froce-feedback mechanism, and a 3.5 millimeter jack into a single bracelet.
It senses steps, monitors, sleep patterns, and stores a month's activity data
for smartphone upload. With one simple device, users can analyze (and share)
bearly every move they make. $100 

Link:
Jawbone
http://jawbone.com/up