Monitor your performance as you ride with this easy-to-install, wireless speed and cadence sensor bundle. The cadence sensor fastens to any size crank arm and tracks pedalling strokes per minute, so you can train for your optimal performances. The speed sensor attaches to the hub of either wheel and self-calibrates with your Garmin Edge to give you accurate speed and distance at all times, even when indoors on the turbo trainer, or in areas where GPS signal is interrupted. Compatible with the Edge 1000, 810, 800, 510, 500. Now also compatible with 920 XT and FR 620 series watch units. Bundle includes speed sensor, speed sensor sleeve, cadence sensor, cadence sensor straps, manual.