Mm-hmm.
Um , also we've got the integrated pushbutton , which is what we're most familiar with. It's the most straightforward. But you can in like incorporate that with a scroll button as well. . Got decisions to make there. And this is what I was just saying before. Linked in the different  depends on what type of buttons we have and the inputs. Um simple would go with the pushbutton. Um , regular you could link with the scroll button. And the advanced we'd have to go with a L_C_D_ s display.
Right.
My personal preferences ? I think we could go for the kinetic energy source. I don't , I think that's quite um an advanced kind of technology. It's not been seen before , so it could be quite a , a novelty factor , attractive as well. And also energy saving 'cause you're producing the energy , you don't need an external sort of battery supply or solar panels. You just give it a shake.