Blink 1A Heart Rate Monitor Watch Designed to operate with very easy one-button set-up and control functionailty Features a proprietary 3-color flashing LED system for easy observation of workout zone status Provides the user with continuous and dynamic (real time) heart rate information Analog transmission and water resistant design make this unit 'best for use' in water environments Includes access to ZONING, the patented threshold training system (US Pat 8092301) of Heart Zones USA