Polar Ft1 Heart Rate Monitor Shows heart rate on large and easy-to-read display Helps improve your fitness with manual heart rate target zone Displays a summary of your latest workout Simple one-button start and coded heart rate transmission to avoid cross-talk Safely exercise within your target zone Polar FT1 Heart Rate Monitor Watch with Polar T31 coded transmitter Chest strap and user guide Shows heart rate on large and easy-to-read display; includes watch features Helps improve your fitness with manual heart rate target zone Displays a summary of your latest workout One-button functionality; Coded heart rate transmission to avoid cross-talk Wristband Size : 8.5  . NOTE - Measurements taken from the LAST HOLE to the END OF RUBBER next to buckle (not from end to end).