www.amazon.com – Garmin Premium Heart Rate Monitor (Soft Strap) Click on the link above now for more customer reviews and specs for the Garmin Premium Heart Rate Monitor, plus save 42% – Monitors your heart rate. – Wirelessly relays data to your compatible Garmin® GPS device. – Compatible with Garmin Colorado 300, 400c, 400i and 400t; Dakota™ 20; Edge 305 and 705; Forerunner 305, 310XT, 405, 405CX and 50; – Compatible with Foretrex 401; FR60; Oregon 300, 400c, 400i, 400t, 550 and 550t.