This headset has a 2.5 mm jack.
Telephone headsets work great for any office--they improve the sound quality on both sides of the call, free your hands, and are more comfortable to use than hand-held phones. On Time Supplies offers headsets in a range of styles and capabilities. Thanks to fast shipping from On Time Supplies, you get your telephone headsets in as little as a day. If you need more information on the supplies featured at On Time Supplies, or on GSA pricing, call us toll free at 1-866-501-6055. We're happy to answer any supply questions.