Flymentor 3d is a stabilization unit that not only stabilizes the rc helicopter against external inputs such as wind turbulence, but will also hold the helicopter in position. The flymentor uses both gyros and and a ccd imaging device to help stabilize the helicopter. The gyros stabilize orientation and the ccd holds position with respect to the ground. Let go of the controls and the flymentor will upright your helicopter (of course within reasonable limits!). This system has multiple applications from stabilizing your aerial photography platform to acting as an electronic insurance policy when you¡¯re learning to fly better. - kds flymentor 3d x 1 set