It's quite logical, considering what each Ring is. Think a beyond-state-of-the-art picophone in ring form. It does everything a smartphone can do - including linking back to either the bearer's Power Battery, or the Central Power Battery of the Spectrum the bearer represents, depending on the location OF said bearer. Most folks that read crossover fanfiction are familiar with one or more of the crossed-over arcs - therefore, such detail that some ask for may be considered extraneous by others. In my case, I'm drawing on my reading and ownership of all seven HP stories, along iwth DC's Tales of the Lantern Corps, and DCUO - which I play regularly on USPC/PC Test - I currently have characters from the Green and Sinestro Corps, and a single RED Lantern (he's a hero character, oddly enough - his mentor is - amusingly - Wonder Woman) on PC Test.