Poly (Plantronics) 3320 Blackwire Stereo USB-A headset is a sleek USB-A headset for your PC or Mac.  Compatible with all major PC softphones from Avaya, Cisco, Microsoft and many more. Poly Blackwire 3320 series is the perfect headset for large office VoIP headset deployment. Key Features:Stereo over the head USB headset Soft foam ear cushionsAdjustable 180-degrees speakersFlexible, bendable boom armTelecoil Hearing Aid Compatible (HAC) Apple Mac OS and Microsoft Windows compatibleHD wideband audio qualityNoise-canceling microphoneComfortable for all day use