The product US website:

http://www.dynaflexpro.com/store/fitness-gyros-accessories/powerdock.html

Lazy to start the gyro with the provided red starter string?

Get a Powerdock - Powerball Docking Station and starts your gyro with a push of a button.

Features

• Compatible: Pro, Pro Plus, Powerballs, Tour Grip, Xgrip, Arm Shaper, Dynagrip
• Requires 2AA batteries (Not included)
• Gyro exerciser ball not included