Thad never shared the true function of the device, lying to the team as he worked on it whenever he had the time.  You questioned him, and he spilled  the truth. "It got.me thinking.... How the cousins of Steel store sunlight, how speedsters keep residual amounts of the speed force even when it's gone. days, hours of power... But this can take it all away, draining them dry. Easy targets for us, the rest of the team have the metahuman cure as a choice... But this is my way... I don't care who says the word I'm not shutting it down. "