The AH-C620R, available in black and white, is the most compact and lightweight Denon In Ear headphone. It uses an 11.5mm driver, mounted in housings combining die-cast aluminum and resin, designed for rigidity and vibration-damping. Denon Acoustic Optimiser technology helps equalizing the air-pressure in front of and behind the driver. It’s all part of making the sound as dynamic and distortion-free as possible.