Yeah.
We can go into that later. Um , all the other things are individual components that we'd have to get in separately , and work out the most , like , effective um circuit , including all the wires and everything like that. And the L_E_D_ of course , that's a light emitting diode. So , we could , so we've got flex flexibility with colours and things , with that as well.
Mm.
Okay , there are lots of different possibilities for the energy source. We could use a basic battery , but that brings with it , like they need to be recharged and the bulk , the size of it as well. And they're not so great to dispose of , environmentally.  There's a hand-powered dynamo which is a sort of thing that was used for torches fifty years ago. A bit out of date. Kinetic energy is something that's been recently developed.