Phone Headset Adapter for Mac Computers, 2.5mm to 3.5mm
Use Your Existing 2.5mm Phone Headset as a Headset on Your MacBook, MacBook Pro, or iMac 2009 or newer. Converts a 2.5mm Plug to a 3.5mm Headset Plug for Use on 3.5mm Mac Headset Jack. Microphone and Audio.