Uh we actually had an option of batteries , solar power , and um a dynamo ,
which is something I don't know what it is. Something to do with torches.
Oh , a dynamo is  ah ,  it's a bicycle. It's a bicycle mechanism. It's the en it's like if if something moves , when it moves , it stores energy.
Oh okay. Yeah , the other one was the other one was a kinetic thing where you'd basically have to wind it yourself.