Well, the LED's, if that's what they are, are back out of sight under the front bezel, just sort of a sub surface light and they're blue. Temp changes? - no, just the readouts.
Ha, my first margarita? - long long ago. Back in Chicago we used to drink them by the pitcher and at Lake Travis we used to rent a margarita machine and on holiday weekends when it was too dangerous to go out on the lake due to weekend tourist boaters from Houston etc. we'd crank it up and party - big time. Finally had to quit as too many people were falling off the docks. Here you can buy 1 1/2 gallon plastic jugs of tequila for around $5, it's not reposada but?
I have a bottle of Quervo Reserva De la Familia, hand numbered, in it's own decorated wooden box. My neighbor gave it to me. She bought it at the distillery store in Tequila which is just a short way from here. Most of the blue agave is grown here in the state of Jalisco.