GARMIN 010-10644-00 Speed/Cadence Sensor
Compatible with Edge(R) 305, 500 & 705 series, Colorado(R) 300, 400c, 400i & 400t, Oregon(R) 300, 400c & 400i & Forerunner(R) 305, 405 & 50 Monitors user's pedaling cadence while riding a bicycle Measures & reports pedaling strokes per minute, providing feedback for optimal performance Self calibrating Wireless;