1 iPad + this app, a total solution for promotion/message delivery based on iBeacon technology.
This app will notify iPhones nearby with Client for iBeacon app installed (https://itunes.apple.com/us/app/id725369296?mt=8) , present texts and images it contains.
This mechanism works even without any network nearby, even the Client for iBeacon app not running.
A Server for iBeacon could be setup by retail store to promote new arrival or discount information, by stadium to deliver new anouncement when people pass by entrance, by teacher to transfer presentation materials to students in same classroom, or by a restaurant to introduce today's special, etc.
With iOS multipeer technology from iOS 7, data can be transfered between Server for iBeacon and Client for iBeacon without cost to user's cellular data plan!
With iBeacon technology from iOS 7 there is almost no addtional power drain to Client for iBeacon user's cell power.
But Server for iBeacon only works when it is in foreground, so plug with power supply in that iPad is highly recommended.
Note: End user will be notified only if there is new message for that specific user, and he/she haven't been notified by the same iPad/store in last 30 minutes.