Omron HR-310 Heart Rate Monitor Watch with Strap and Tap on Lens (TOL) Function. Functios: Heart Rate Measurement: Analog Heart Rate System Heart Rate Zone Alert: Upper and Lower Zones Stopwatch. Visual and audio alert. User profile: Gender, Age, Height, Weight, Exercise Habit, and Fitness Index. Instant Percentage Heart Rate (%HR). Calories Burned. Average heart rate. Clock/Date/Day. Alarm. EL Blacklight.