Corded office headset
A corded on-ear office headset whose 3.5 mm plug works with phones directly, or with a USB call control unit for computers. It has no battery or Bluetooth.
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3.5 mm plug or USB
The headset cable ends in a 3.5 mm plug for phones and tablets. For a computer, it plugs into the USB-A or USB-C call control unit.
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Call control unit
The control unit on the cable answers and mutes calls and adjusts volume, and a busylight shows when you are on a call.