This is a simple ibeacon demostration using Garrison RT02-BT. Here we showed the how iphone detects the 2.4GHz bluetooth low energy (with ibeacon firmwire advertising a UUID). Any android mobiles equipped with bluetooth 4.0 also works the same.
The signal RSSI received from transponder would be used for ranging BUT do not provide any hints on direction. So actually the direction appears on the screen is only for the ease of illustration purpose only.
Please also see other posts
Extended battery ibeacon tag.
Ibeacon proximity marketing