This is a digital heart rate monitor chest strap for use with the Garmin Forerunner 305, Forerunner 405 and Garmin Edge 305.
Comfortable Chest Strap
Displays heart rate data on the Forerunner 305, Forerunner 405 and Edge 305,500,800,510,810
Heart Rate Alerts
Heart Rate Monitor Transmitter
Expandable Chest Strap
Physical Size (WxHxD): 13.7" x 1.4" x 0.5"
Transmission Range: approximately 3 metres
Battery: CR2032 (3 volts - self change)
Battery life: approximately 3 years (with 1 hours use per day)