Looking for Bluetooth Leash app between phones? topic

Hi,

Im looking for an app that works like a bluetooth leash which has some/all of the following features:

1. 2way talk (over Bluetooth)
2. Proximity alert (ability to emit sound when a device goes out of range)
3. Proximity Radar (you know how some Wifi devices can map the direction of the AP)


Ideally these would work with other linked Bluetooth phones, rather than BT tags etc.

thanks in advance.