Comfortable USB headset for your computer. Compatible with all the softwares from Avaya, Cisco, Microsoft and many more. Poly Blackwire 3300 series is the headset for large office VoIP deployment. Monaural headset style. Supports long-wearing comfort with a comfortable, padded headband and pillow soft ear cushions. Adjustable 180-degrees pivoting speakers. Flexible, bendable boom arm. Apple Mac OS and Microsoft Windows compatible. HD wideband audio quality. Noise-canceling microphone. 94 dBSPL± 4 dB speaker sensitivity. Impedance 32 ohm. SoundGuard: Acoustic limiting for protection against sounds above 118 dBA. G616 support limits the level to 102 dBSPL. 100 Hz to 10 kHz optimized for PC wideband audio up to 6.8 kHz microphone frequency response. Sold by each. Black.