Jabra GN2110 ST Mono with GN1200 Cable Brand New Includes Two Year Warranty Product # 01-0241 The Jabra 2110-ST Monaural Headset (01-0241) is the first ever to use Acoustic Transmission Line (ATL) technology, which transmits sound waves through the SoundTube at precise intervals. The GN Netcom's ATL technology eliminates sound reverberations and distortions usually associated with voice tubes. The GN 2110-ST SoundTube headset features a flexible boom that ensures correct microphone positioning. This Soundtube is excellent for noisy environments, the noise-canceling microphone filters out distracting background noise. The GN 2110 SoundTube Headset is available in a variety of styles to accommodate all user preferences. Jabra 2110-ST Headset Features: ATL Technology For Superior Sound Quality Convenient Swing-Away Boom SoundTube w/ Omnidirectional Mic Single Earpiece Over the Head Headset