They need:
A fruit and veggie electricity kit!
That’s my son! ^ This was so easy to use and he loves it. There is a small red light and a clock included so that when you hook it all up, the fruit and veggies become batteries that power them! Just make sure you are using acidic veggies and fruits. For us it worked with oranges and potatoes. I think apples and tomatoes will work too. As you connect more fruits and veggies (up to three total), you increase the power, and the light will get a little brighter. Great gift idea for kids 3+ BUT PLEASE NOTE: Instructions are not in English but there are diagrams we were able to follow.