Garmin Forerunner 50 Sports Watch with Heart Rate Monitor & USB ANT Stick for $49.99 shipped.  Here is a screenshot for your reference.  It features a digital heart rate monitor continuously tracks heart beats per minute and wirelessly transmits to the Forerunner 50 and the data can also be automatically transferred to the computer when the device is within the range of the USB ANT Stick.  It usually sells for over $75.