Garmin Foot Pod [Retail Packaging]
This tiny foot pod is small enough to attach to your shoelaces or fit in  the mid-sole pocket of compatible shoes. It's always ready to use, and a  small, replaceable watch battery powers the foot pod for a year of  training. Unlike simple pedometers, this foot pod uses advanced MEMS  inertial-sensor technology to analyze your movements and is responsive  to stride-length changes to achieve 98 percent accuracy for speed and  distance.  Additionally, this sensor measures running cadence to help  you optimize your training.Compatible products for this item are:Forerunner 210Forerunner 305Forerunner 310XTForerunner 405Forerunner 405CXForerunner 410Forerunner 50Forerunner 610Forerunner 910XTFR60FR70Garmin ANT+ Adapter for iPhone