HD voice clarity: The SH 330 IP wideband headset delivers natural high-definition sound for superior voice clarity, accented speaker recognition, and reduced echo Extra comfort: A duo adjustable headband for a balanced fit Optimum clarity: A noise-cancelling microphone filters out ambient sounds for clearer speech Precision positioning: 300° adjustable microphone boom for personalized mic placement Acoustic excellence: The unique foam ear pad channels sound for maximum speech quality Protected hearing: ActiveGard®* technology protects against acoustic shock and sudden sound surges Peace of mind: It has a 2-year warranty Sennheiser Communications patented technology