Polar FT2 Heart Rate Monitor,Blue Wristband Size : 8.5  . NOTE - Measurements taken from the LAST HOLE to the END OF RUBBER next to buckle (not from end to end). Wristband Size : 8.5  . NOTE - Measurements taken from the LAST HOLE to the END OF RUBBER next to buckle (not from end to end). Shows heart rate on large and easy-to-read display Helps improve your fitness with automatic age-based heart rate target zone Displays a summary of your latest workout Simple one-button start and coded heart rate transmission to avoid cross-talk with other heart rate monitors nearby Includes T31 coded heart rate transmitter; Requires and includes chest strap for accurate heart rate