Bluetooth 1.2 (2003): Adaptive frequency-hopping spread spectrum (AFH) and Extended Synchronous Connections (eSCO) improve resistance to radio frequency interference and voice quality of audio links.Bluetooth 1.1 (2001): Fix many errors found in v1.0B, and add the possibility of non-encrypted channels.Bluetooth 1.0 and 1.0B (1999): Products weren’t interoperable and anonymity wasn’t possible.
