An optional part of the Bluetooth specification that provides a faster data rate (speed) and possibly improved battery life. Not all Bluetooth devices support EDR and will depend on the Bluetooth version and supported profiles. Both devices need to support EDR, in which case EDR is used automatically.
The bit rate of EDR is 3 Mbit/s, although the maximum data transfer rate (allowing for inter-packet time and acknowledgements) is 2.1 Mbit/s. EDR uses a combination of GFSK and phase-shift keying modulation (PSK) with two variants, π/4-DQPSK and 8-DPSK. EDR can provide a lower power consumption through a reduced duty cycle.