Keep them In The Know
Place a Qnow™ sticker on the front door or office window. Make sure folks know about it and 'One Click' to put it on their home screen.
They don't even have to get out of their car, just point their camera phone and zoom in.
Now you can keep everyone notified in real time to whatever you need.
Need something changed? Once posted it's live and everyone has it immediately because the system refreshes on each visit from the cached Google Cloud.