amplify the signal and all that is being sent to the infrared lamp up there. Now as you can see this is the the rubber button version of it.  Um the way it works is that you have the keys here. The rubber button has a little metal uh plate on the other side , which closes the circuit here. And thus gives on the signal. Now this is the simple version.  Um we are talking um this this the simple and cheapest version at the same time. We are talking something more complicated of course , it's going to be more expensive as well. And not only that. Um we are also restricted in the use of our outer shell , or in the material that we could use for our outer shell. Um  I've gotten some information that we could use for the case material plastic , rubber , as well. Um rubber that is used in these anti-stress balls. So it's pretty squishy. That would that would serve that purpose.
Spongy ?
Um  we could also use wood , or titanium.
What's the approximate per hundred thousand for the titanium ?