and that's the the back of the interface. And this is a push-button one , so you see these little little buttons here , they're little rubber rubber buttons that go through onto the the board at the back and they push these buttons here. Um  and we  that's the basic construction that we've got to got to accommodate. We got to have something that pushes the little buttons that um talk to the chip that encodes the message that sends the the message to the receiver. So um I wan I wanna go through not not just addressing the um  uh the the points that you made , Sarah , but um  doing my presentation in the order I wrote it.  So first of all um I wanna talk about what possibilities we've got for the energy source.
Um we can have your bog standard double double A_ batteries in a replaceable um little compartment. We can have a hand   sorry
A wind-up.
a wind-up , yeah ,  which I think is quite an interesting concept for a   sorry  for a remote control ,