The Hisenior Mega5-EST 7th Anniversary Edition Hybrid Driver IEM features a custom 10mm bio-cellular diaphragm dynamic driver, delivering rich, airy, and dynamic bass with minimal distortion. It is equipped with 2EST super tweeters, providing an impressive S-highs extension up to 80Khz. These earphones are tuned according to the Harman IEM target curve, ensuring a smooth and coherent sound from bass to treble, with detailed and clean instrumental definition. This anniversary edition boasts several upgrades, including a more compact shell, a redesigned sound nozzle, reconfigured internal drivers, a new air vent, and 4 ways integrated crossover with triple-bores and 3 dampers tuning sound system for an enhanced audio experience.