Sennheiser  SH 350 Binaural Headset with Microphone Active Guard safeguards the user from the effects of an acoustic burst Independent double-sided headband adjustment for Individually preferred positions and maximum comfort Self-adjusting ball-mounted speaker capsules allow perfect fitting to the head 300 Degree adjustable microphone Boom allows the mic to be positioned exactly for optimal speech clarity. Sound remains superb whether using the leatherette or foam ear pad. Exremely lightweight and comfortable Microphone and headband are all adjustable Noise cancelling further reduces stress Pivoting microphone boom for easy transport mand storage Two sided headset