Garmin Heart Rate Sensor HRM-DUAL 010-12883-01 Brand: GARMIN -- Product Name: GARMIN HRM-Dual Category: Heart Rate Monitor Color: Black Brand: GARMIN Condition: New *Please note: Only the transmitter sensor is for sale. The strap is sold separately. [Usage]: Unused [Supported Standards]: ANT+/Bluetooth Wireless [Battery Life]: Approximately 3.5 years (1 hour use/day) [Continuous Use Time]: Up to 10 hours (From GARMIN.com)