Ultra noise-canceling (UNC) microphones. noise-canceling models feature an extended boom for industy-leading noise-canceling and echo performance, allowing for even clearer conversations in noisy environments. Call quality at the next level. adding a Plantronics amplifier featuring clearline â¢ or audio iQ Â® technology protects from loud noises, reduces echoes and background noise, and equalizes call volume. Excellent receive-side audio quality a greater receive-side frequency response improves listening intelligibility. Comfortable, lightweight design. adjustable headband, foam ear cushions and comfort t-Pad design create a stable, comfortable fit. Bendable click-stop microphone boom. stays in position for clearer voice transmission. Small, light, flexible cable. Designed for lightweight durability, with a single-cable design for binaural models. Quick call feature. headband twists out of the way for convenient quick call pick up. Monaural or binaural styles. Monaural lets you hear the conversation and whatâs going on around you. Binaural cuts out distracting background noises.