I first thought it would let me make free phone calls but then I remembered it wasn't 1980s anymore. So this thing sits on top of your admin bar and shows lots of data but has a X u can click to close it if you need to poke something on the admin bar. but unlike other plugins, this one is all compact, so instead of showing 1000 queries at the bottom of the page it keeps them neatly in a floating panel that follows me around the room when i get high enough. but its really useful compared to the other ones i used in the past. yeh.