AT&T Marathon™. Brand New.. The AT&T Marathon is a cordless headset for corded and cordless single and multi-line telephones. It has a unique antenna design and advances in noise-filtering technology which provides long-range coverage and clarity. This headset offers DECT 6.0 technology which provides superior quality of voice and sound, high protection against wiretapping and better range than 2.4GH z and 5.8GH z phone systems... The Marathon headsets add mobility to conference calls by using up to 2 headsets at once. It provides multiple installation options which expand the convenience of business phone, or home system.

This headset features 5-level audio volume control and ringer volume control... Marathon