TomTom BT Cadence/Speed Sensor $59.99
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Compatible with TomTom Multi-Sport GPS...
Compatible with TomTom Multi-Sport GPS Watch
-Measure your pedal stroke and speed in real-time to help you perform at your best, indoors and out
-Mounts easily to your bike
-Bluetooth? Smart technology for enhanced battery life and compatibility
-Battery included (CR2032)