Features: The wrist power gyro ball automatically starts and displays rotation speed, and force applied, time, and calories burn. Features a clear blue backlight for easy monitoring of your training result. Light weight and easy to carry, can used at any time home, in office or on the road. Adopts advanced gyro structure. The faster it rotates, the great resistance. Silicone wrap handle provide comfortable, nonslip grip, complementing hand rotation movements. Specifications: Component: ABS Type: No Lamp 01 Black/No Lamp Blue/No Lamp Black/luminously 01 Black/Five Color Lamp 01 Black/luminously Blue/Matte Black Counting Five Color Lamp/Matte Gold luminously Counting Size: As Shown in the Picture Package Includes: 1pc Hand Exerciser note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.