treVolo U is the first Bluetooth speaker engineered specifically for e-learning. It has two unique features Enhanced Human Vocals and Safe Volume, as well as six distinct sound technologies (two-way speakers with dual drivers, high-sensitivity analog microphones, AEC: Acoustic Echo Cancellation, audio enhancements for sound clarity, custom sound modes, and Safe Volume) that combine to make its sound clearer so as to create the most immersive learning environment.