LED Wrist Ball Exercise Machine, Gyroscope, Amplifier, Gyroscope, Powerful Ball, Hand Exercise Machine, Power Ball, Gym Simulato|Power Wrists(Blue) Product Features: *1. Mechanical power, no power required. The centrifugal force is generated by the rotation of the wrist and the rotation of the ball inside to maintain the rotation of the core. *2. Metal core, sturdy and durable. *3. Variable speed lighting, bright and dazzling. *4. The spring part is optimized for structure, pulling more smoothly and reducing noise. *5. Compact and lightweight, portable and easy to store. Note: 1.All pictures are professionally color-coded, but due to the different ambient light and different display device settings, there may be some deviations between the pictures you see and the items themselves. Please understand. 2.The data is measured manually, there may be some deviation, but it does not affect the use.