Um power source , I figured , batteries , 'cause they're easily available. Typically a remote has either two double A_s or four triple A_s , sometimes three. Uh it really kinda depends on the size of the actual remote itself.
Um a large on-off button ,  demographically we're moving towards an older generation of people , so a large on-off button would probably be good.
Hmm.
Selection button for various entertainment devices , so you want something that will permit you to select the D_V_D_ player or the T_V_ or the stereo system. Um smart chip that perverts  uh that permits , sorry , universal application again , something that'll allow us to skip over between devices , and that's kinda it.