Plantronics DSP-100 Mono-Headset. Device connectivity: Wired, Cable length: 3 m. Headphone frequency: 80 - 12000 Hz, Headphone sensitivity: 80 dB. Microphone sensitivity: 50 dB. Minimum RAM: 16 MB, Minimum processor: Pentium II 166 Mhz. Minimum system requirements: PowerPC 604 SVGA CD ROM USB, Compatible operating systems: Windows 98 SE/Windows 2000/Mac OS 9.0.4