Zalman Gaming Stereo Headset with Microphone & Built-in Volume Control, Black (HPS200) 40mm driver unit applied, Clear sound with no disturbing noise High quality microphone, Freely adjust the position of the flexible microphone, Deliver clean speech in a variety of applications Volume Control; Easy control volume through built in volume control on the headset High quality unit applied for strong bass performance Adjustable head ban with comfortable fit; Flat cable applied to prevent cable from twisting Long length cable for convenient usage even when having a distance from the PC Impedance; 2.2 / Max Power; 20mW / Weight; 275g (with cable) Frequency Response; 20Hz - 20,000Hz / Headphone Sensitivity; 118dB / Microphone Sensitivity; -54dB 3dB