This is a completed action toy designed for collectors.
From the Hasbro website:
Enter the world of "Star Wars" and launch into action and adventure! Discover a galaxy of starships and vehicles, and get immersed in exciting stories of good versus evil against a backdrop of a universe populated by heroes, villains, droids, and space creatures with the Star Wars Bladebuilders Extendable Lightsabers!
Imagine the thrill of a heated battle with this "Star Wars: A New Hope" Darth Vader Extendable Lightsaber that extends with a flick of the wrist. Combine with other Lightsabers in the BladeBuilders system (each sold separately) and imagine the thrill of battle with a custom Lightsaber!