Blue lightsaber was the originally wielded by Anakin Skywalker before he turned into the Dark Side of the Force. Jedi Master Obi-Wan Kenobi took it from him at the Duel of Mustafar. Obi-Wan gave it to Luke Skywalker after he rescued Luke from a Tusken Raider.
You can be like Luke with this Star Wars Luke Skywalker lightsaber. This blue light up telescopic blade lightsaber is not meant to battle a Sith, but it’s mega-cool to accessorize your Luke Skywalker Jedi costume.