Star Wars Obi Wan Kenobi's Force FX Lightsaber from Hasbro's Signature Series from Episode III : Revenge of The Sith.
This is a fully functioning replica of the most popular weapon in the Star Wars movie francise, featuring all the lights, sounds and heft (weight) of the actual Jedi weapon.
The Force FX was initially produce by Master Replica.
Hasbro then obtain the licensing rights to produce the Force FX line, which is said to be the same as the Master Replica's.
The blade is made of polycarbonate with LED that lights up once activated.
The saber uses 3 AAA batteries. The guy at the shop (Graffitti Toys) warns that it should only use Energizer batteries. This (according to that fellow) is because the compartment for the batteries only fits the Energizer brand.
It produces 5 differnt sound effect from the movie; Power-up, idle hum, swing, clash & power down.
My only gripe is that ist not that movie accurate as the hilt is slightly larger. Of course this is acceptable since that's where the electronic is.
The also came out with Luke Skywalker's from A New Hope (ANH), Empire Strikes Back (ESB) & Return of The Jedi (ROTJ). Goes the same for Darth Vaders.
Theres also Anikin's from Revenge of The Sith, which in my opinion should be the same as Luke's from ANH, but since the purpose of a company to make money, they made all variants each with different additional details.
Coming soon : Darth Vader's Force FX Lightsaber