Bluetooth-connected weighted jump rope set for high-intensity interval & endurance fitness training AMP 2.0 lets you easily switch between up to 4 sets of AMP handles for smooth rope transitions, and use a triple-click on your Bluetooth handle to instantly rewind intervals Burn calories faster: Crossrope App provides personalized jump targets, benchmarks and stats tracking, plus Free Jump Mode. Membership activation instructions delivered upon product receipt Elevate performance training in major muscle groups: real-time jump counting technology & feedback Track fitness progress & earn badges for completing workouts; Perfect for a gym, office, travel or home workout Crossrope AMP 2.0 Smart Jump Rope Set with 1/4 LB, 1/2 LB & 1LB Jump Ropes – Bluetooth-Connected, High-Intensity Fitness Training for High Calorie Burn and Cardio - Small - Membership Required