The Scosche myTREK App manages pulse, training type, calories burned, distance run*, music and more. Made for iPod touch (3rd & 4th gen), iPhone 4, iPhone 3GS.Click here to view the myTREK online user manual: iPhone onlyThe Scosche myTREK App is a health and fitness application designed to work exclusively with the Scosche myTREK Wireless Pulse Monitor. This award-winning app displays real-time pulse, target training zone, calories burned, distance/speed of run*, total workout time and provides voice prompts during the workout. With the Scosche myTREK App, you can manage your current and past training sessions to get the most out of your workouts. PULSE: Accurate pulse monitoring lets you assess the intensity of your workoutTRAINING ZONE: 5 color coded training zones allow you to quickly indentify when you are in the desired intensity levelCALORIES BURNED: Observe the amount of calories burned to maintain a healthy body composition and work toward your goalsDISTANCE/SPEED*: Track your actual distance and speed using the iPhone's GPS and accelerometer technologyWORKOUT TIME: Identify your overall workout time to help you stay motivated throughout your workoutCOMPATIBILITY REQUIREMENTS: The Scosche myTREK App is compatible with the iPhone 3GS, iPhone 4 and iPod touch (3rd and 4th generation) running iOS 4.0 or later.Disclaimer: This is not a medical device and is intended for recreational use only. Consult a physician prior to use to determine appropriate heart rate zones.