The laser screwdriver is a very fun toy. I have hardly put it down over the last 2 days.
When I bought this, it took me a while to put in batteries and if you are wondering then turn it a bit anti clockwise and the top comes off and brings the battery case up too. Then I was ready to go.
There was a trigger button on the side and if you push it down a little it extends! push it down full and it activates the laser noise! Hold for two seconds and it makes a really cool ageing noise! (Do not work in closed off mode)
At the bottom of the screwdriver there is a spinning part. I do not know what it is for though. It only spins if you twist it! If you/your kids like carrying it around it sticks out a bit. But that doesn't matter too much.
And if you buy it in a high street shop, you have a better chance of a good one, because the amazon ones are a little bit dodgy according to others.
You will love the laser screwdriver but look after it! They're rare now!