The Lightsaber Academy interactive Battle Lightsaber is a toy my kids have loved so far.
It's a pretty simple idea, and really easy to set up. After that I am clueless on how the technology works, but it is very cool.
You need 3 "AAA" batteries (not included) and a phone or tablet to download the 'interactive' part. I suggest an iPad, if possible, simply because that's the easiest to see, especially for children.
I would suggest to download the app first. Then, while the app is downloading you'll want to install the batteries. Start the app, then 'pair' it with the lightsaber (push and hold a button on the saber itself--it took maybe 5 seconds to pair up) to get started. You'll have to 'tune' the lightsaber before use, which is very simple. From there you can choose from half-a-dozen recognizable Star wars characters, and a few extra characters if you scan the QR code on the instructions.
The game itself is fairly challenging (starting off pretty slow then gradually getting harder). There are single player and 'head-to-head" choices. For single player the game will have you match stances, then motions, then a 'fruit ninja' style portion of the game against floating droids. Head-to-head are basically the same challenges but you're scored against another jedi trainee, using either their own lightsaber or trading off with the same one. They get points in the form of crystals for completing tasks correctly, which unlocks things farther into the game.
There are a lot of cool details included with this. There is a 'crystal' (as Star Wars nerds like myself know this is an important part of building a lightsaber) that you can press that changes colors--and the color of the lightsaber--depending on which master you're learning from: Luke is blue, Yoda is green, Kylo Ren and Darth Vader are red, etc. It also makes the lightsaber noises when you swirl it around or do cool things in the game.
The only frustrations we've run into are small. The instructions don't give a clear way to turn the saber off (figured out it's holding down the pairing button) so that was a little annoying to try to figure out. The biggest frustration for my kids is not getting an explanation on what they've done wrong when trying to play. They'll try to 'match' a stance on the screen, appear to have done it right, only to get a score of "0" with no real indication as to why. It's been a minor frustration for them, but it hasn't kept them from wanting to play.
The app works pretty well most of the time, but things like that could be improved with a clear explanation of both what they need to do to get a good score, and what they've done wrong when they don't get a good score.
Also, you should obviously make sure anyone playing is in a pretty clear area, as there are some pretty wide swings required by the game sometimes.
Overall this is a pretty inexpensive toy that has the look and sound of a light-saber, and gives a fun way to feel like you're really doing something with it instead of just swinging it around. For such a small price this is easily a winner of a gift for Star Wars fans!