Exercise smarter with the Tangram Rookie jump rope. It syncs to your phone, so you'll see data like jump counts, calories, and duration. You can even set goals and keep track of your achievements. It powers on automatically as you start skipping, so you can see your count in real time. Plus, it's completely adjustable to fit almost anyone. The lightweight, durable, and smooth rope won't slow you down.Good to know- It stores up to 1000 sets of exercise data, so you can keep tabs on your progress- It uses non-contact sensors for accurate position tracking of the rope- There're metal alloy ball bearings in each handle, so every skip feels smooth and effortless______________________________________________Please note: If the battery compartment does not close securely, stop using the product and keep it away from children. If you think batteries have been swallowed or placed inside any part of the body, seek immediate medical attention.