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. Pair 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. The Small (S) rope is for users 5 ft. to 5 ft. 4 in. (152 to 163 cm) tall. The Medium (M) model is for users 5 ft. 5 in. to 5 ft. 9 in. (165 to 175 cm) tall. The Large (L) model is for users 5 ft. 10 in. to 6 ft. 2 in. (178 to 188 cm) tall. The Extra-Large (XL) model is for users 6 ft. 3 in. to 6 ft. 7 in. (191 to 201 cm) tall. 23 LEDs embedded in the rope display your fitness data in mid-air Pairs with Smart Gym app on iPhone, iPad, and Apple Watch to help you exercise smarter App and firmware updates keep the experience fresh and new Proprietary magnetic sensors accurately track each jump Two sets of ball bearings in each handle ensure smooth, natural motion Award-winning product design and user experience Tangram Factory Smart Rope LED Jump Rope Zippered nylon pouch Charging cable Quick start guide Other Features: Bluetooth, Health App Compatible Connections: Wireless Bluetooth Compatibility: Bluetooth 4.0 Power Source: Battery Batteries: Rechargeable lithium-ion Mfr. Part Number: SR2_WH_L UPC or EAN No.: 8809314061798 Note: Products sold through this website that do not bear the Apple brand name are serviced and supported exclusively by their manufacturers in accordance with terms and conditions packaged with the products. Apple’s Limited Warranty does not apply to products that are not Apple branded, even if packaged or sold with Apple products. Please contact the manufacturer directly for technical support and customer service.