A gadget that greets you when you cross a door on arrival or leaving
Going through a door is a major change in the surrounding environment. (ie.: from street to shop)
It is measured to spend 2-3 seconds each time while going through the door. Those seconds are valuable time to pass on some crucial information about the place.
The information you feed could be simply some nice welcome message or more sophisticated briefing or offer from the place. Also, it can be used to give necessary protection messages such as: Welcome, to the welding area of our company, please wear your protecting hats!
Printed signs are similar, but basically easier to be missed. This audible version is no way to miss (well, basically) and can give additional values to your place with better harmonized communication methods.
It should be easy to build from a small computer, an amplifier, speaker and a movement detection part and could be attached to doors or even just to entering lanes.
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I don't think most people enjoy being barraged with information or even general noise directed at them the very moment they walk into some place.
Although occasional information may be helpful the encroachment of automated messages is annoying enough on a telephone where the maze of push 1, push 2 and finally a session of a quarter hour of insipid music before anyone helps you can generate full blown anger. I don't enjoy speaking to machines who have the minds of low order insects, if that, and a series of doorways giving me advice is enough to drive anyone psychotic.