Sennheiser CC 510 Headset with UI 760 Amplifier
The CC 510 is a lightweight, over-the-head monaural headset that offers not only excellent sound quality, but ease of use and comfort as well. The included foam and leatherette ear cushions allow you to get the fit that's comfortable for you, and the adjustable microphone boom allows you to wear this headset on either ear.
In addition, the CC 510 can be converted to an on-the-ear headset with the addition of the Earloop Conversion Kit from Sennheiser.
The UI 760 amplifier allows you to make and answer calls on most corded office phones and PCs alike (with the use of the CUIPC-1 cord).