Sci-fi Coasters with Docking (stand)

I love how everything in most sci-fi universes apparently has an interal power source for some reason, and I thought that coasters shouldn't be any different. Future coasters would probably have some sensors that would detect if a glass is empty and alert the bartender -bot immediately, right? I made these sci-fi coasters with a “docking” station to get that future space-age feeling, really works for me :D Boost MeI would super appreciate a boost! :D