Yealink YHS36-Mono-3P Description:
"Wideband Headset Compatible with Cisco 79xx IP Phones,Avaya callmaster V and VI(Mod plug wiring:R,M-,M+,R)
? Monaural Ear (single ear)
? Quick-disconnect (QD) cord
? RJ9 Headset Jack
? Noise-Canceling Microphone
? Hearing Protection
? Leather Ear Cushions"