Plantronics M22 Telephone Headset Amplifier and Audio Enhancer with In-Line controls for Mute, Volume, Microphone and Speaker settings - 43596-40
Plantronics Blackwire C5220 - Wired, Dual-ear (stereo) Headset With Boom Mic - Usb-a, 3.5 Mm To Connect To Your Pc, Mac, Tablet And / Or Cell Phone : Target