Garmin SDM4 Foot Pod for Forerunner

The Garmin SDM4 Foot Pod is an Upgrade accessory for select Garmin Forerunner models. Whether you're training for running a marathon, for your appearance, general fitness, or preventing further admonishment from your cardiologist, Garmin's Forerunner series is a performance watch that also observes your state of fitness when on-the-go. For one thing, it measures your heart rate. The Garmin SDM4 is an accessory pod that measures your pace and actual steps because, in addition to route distance, these provide individual characteristics that determine how you're performing your run.
The Garmin SDM4 foot pod transmits distance and pace Data to compatible Garmin FR and ForeRunner models. It's lightweight and small enough to attach to shoelaces or fit in the mid-sole pocket of compatible shoes.
Whether you jog, run, or walk, know how you're stepping and what you're getting from it. 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% accuracy for speed and distance. Additionally, this sensor measures running cadence to help you optimize your training. What all this means is that, when used with a compatible Garmin Forerunner fitness watch, the Garmin SDM4 is a reliable instrument you can depend on for fitness and fun.

High-tech accelerometer-based foot pod adds indoor/outdoor speed & distance capability to compatible models

Attaches to shoelaces (with included holster) or in the mid-sole pocket of select footwear

Lightweight - under 1 ounce

Uses Garmin ANT+ transmission technology

Small size - just 1 wide x 1.8 long x .25 thin inches

Compatible with Garmin FR60 and Forerunner 50, 305, 310 and 405 models