The Zeus-XR ADEL features the world's first and only patented technology that safely delivers a louder, more spacious and richer sound – all while avoiding the risk of hearing damage caused by in-ear monitors. When the ear canal is sealed by an in-ear monitor, the driver vibrations create harmful pneumatic pressures in the confined space. The #ADEL technology features a secondary eardrum that absorbs the pneumatic pressures produced by in-ear monitors and provides a much safer listening experience. It delivers sound the way it was meant to be heard. With the ADEL, bass sounds deeper, midrange is clearer and highs sound richer than ever.