e2e 4.0 doubles the transmission speed between the hearing aids on each ear, with transmission time between ears reduced from 5ms to 2 ms. This allows for faster, more advanced processing. The new e2e 4.0 system can now synchronize the timing of the signal processing in each ear, preserving the timing and level differences of the sounds as they arrive at each ear and allowing the brain to make use of these natural cues to better localize sounds. The increased speed of e2e 4.0 also ensures that feedback cancellation is better synchronized between the ears for a smoother sound experience.