Tangram Factory - Smart Rope - LED Embeded Jump Rope - Displays Progress in Air - Chrome, M Length: M 258 cm (165 - 175 cm tall) Weight: M 308 g Connectivity: Bluetooth 4.0 LE two-way communication with smartphone LED: 23 X 5600K color tmemperature LED Battery: Full Charge in 2 hours 36 hours of use Lithium Polymer battery *Micro-USB Charger not included* Range of sizes to fit everyone! The evolution of the classic jump rope The best cardio workout around - anytime, anywhere Track your jump count, calories burned, and get interval training recommendations Syncs with the Smart Gym mobile platform, available for iOS, Android, Apple watch, and pebble watch - monitor progress and compete with friends Charge in 2 hours for 36 hours of activity or about 30 days of use