Sleek and lightweight, GN 2100 SoundTube headsets are the first ever to use Acoustic Transmission Line (ATL) technology - the first significant advancement in voice tube technology and design. GN Netcom's ATL technology eliminates sound reverberations and distortions usually associated with voice tubes. The result is superior sound quality. For more demanding applications, GN 2100 Flex headsets feature a flexible boom that ensures correct microphone positioning. Perfect for noisy environments, the noise-canceling microphone filters out distracting background noise. The GN 2100 Series is available in a variety of styles to accommodate all user preferences, including monaural or binaural. The GN 2110-STD model is unamplified.