This is a replacement for the wireless speed/cadence sensor, GSC 10, that is included with the Edge 305CAD GPS. The GSC 10 contains sensors to detect signals from the wheel and crank arm magnets. The wheel magnet mounts to the rear wheel of the bicycle for speed sensing and the cadence magnet attaches to the crank arm of the bicycle. The wireless speed/cadence sensor can be used with the Edge 305HR with Heart Rate Monitor.
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