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Whether you're indoors or out of GPS range, with this foot pod attached to your laces you'll effortlessly monitor your cadence, speed and distance. The Garmin SDM4 is more advanced than most pedometers, using MEMS inertial-sensor technology to analyze your movements with 98 percent accuracy for your most important metrics. Powered by a small, replaceable battery, the SDM4 trains with you for up to a year before requiring a new battery.