4iiii Sportiiiis Heads Up Display System with Heart Rate Monitor Multi-colored LED boom provides instant visual feedback of critical workout and racing data (Heart Rate, Cadence, Power, Speed, Pace, and other ANT+ compatible data)Adjustable boom easily attaches to virtually any pair of glasses. Built-in speaker provides spoken audio prompts with detailed levels of performance. TipTapTM technology allows changing between display settings and receiving detailed zone information by simply tapping on the unit Compatible with Training Peaks and other leading software to upload and analyze workout and race data Includes heart rate monitor