Experience the evolution of a cardio workout classic with the Tangram Factory Smart Rope LED jump rope. Thanks to the 23 LEDs in the rope connected to magnetic sensors, you can see your fitness data in mid-air as you jump. Two sets of ball bearings in each handle guarantee smooth, natural motion.Smart Gym Pro appPair Smart Rope with the Smart Gym app on your iPhone, iPad, or Apple Watch. It accurately records each complete revolution of the rope as a complete jump, as well as monitoring calories burned and workout times. The app offers interval training recommendations and keeps you motivated by unlocking awards and supporting competition with friends. In addition, you can sync it with Apple HealthKit to help provide an even more accurate picture of your overall well-being. Size : LThe Large (L) model is for users 5 ft. 10 in. to 6 ft. 2 in. (178 to 188 cm) tall Conditions : Brand new, never opened.อ่านเพิ่มเติม