The Yaka Arrow Controller is a cerebral implant that allows an individual to control the Yaka Arrow. It is directed through whistling. Despite the implant being connected to the brain, Yondu claimed to control the arrow with his heart, not his head.
Does Yondu really whistle? The other key quality of Yondu's is his ability to whistle and not just to entertain, but to control that nifty arrow weapon thing.
Is Michael Rooker in Guardians of the Galaxy 3? Writer-director Gunn said today that the blue-hued alien with the deadly arrow whistle, memorably played by Michael Rooker in the first two Guardians of the Galaxy films, will not be miraculously resurrected in GOTG 3.