I would tell you but the NSA would be knocking at my door within the hour....but, it would be best if you and your neighbors remained indoors as much as possible and wear aluminum foil hats (double thickness minimum) with the shiny side out.
We already know they're listening in on phone conversations and collecting digital transmissions. Well...what about the spoken word? You have no expectation of privacy in any other form of information transfer....I'm guessing it's a sound recorder relay.
that would be a radio reciver for remote control to turn the light on and off by demand and in the event of an emegency also it can tell if the bulb is working or not