Features: The wrist power gyro ball automatically starts and displays rotation speed, force applied, time, and calories burned. Features a clear blue backlight for easy monitoring of your training results. Lightweight and easy to carry, can be used at any time at home, in the office, or on the go. Adopts an advanced gyro structure. The faster it rotates, the greater the resistance. Silicone-wrapped handle provides a comfortable, nonslip grip, complementing hand rotation movements. Specifications: Component: ABS Type: No Lamp 01 Black / No Lamp Blue / No Lamp Black / Luminous 01 Black / Five Color Lamp 01 Black / Luminous Blue / Matte Black Counting / Five Color Lamp / Matte Gold Luminous Counting Size: As shown in the picture Package Includes: 1 pc Hand Exerciser Note: Please allow 1-2 cm errors due to manual measurement. Make sure you do not mind before ordering. Due to differences between monitors, the picture may not reflect the actual color.