Plantronics M100/R Bluetooth Headset Dual mics, Digital Signal Processing (DSP) and wind reduction technology reduce background noise and deliver clear conversations Echo cancellation improves your listening experience on both sides of the conversation Automatically adjusts sound levels so you can hear every word clearly when moving in and out of noisy environments Lightweight, ultra-slim design for a stable, comfortable fit Soft gel ear tips, in 3 different sizes, together with an optional ear loop provide multiple wearing options for your perfect fit - with or without glasses