Sennheiser  SH330 Monaural Headset with Microphone Active Guard safeguards the user from the effects of an acoustic burst Easy disconnect Self-adjusting ball-mounted speaker capsule allows perfect fitting to the head 300 Degree adjustable microphone Boom allows the mic to be positioned exactly for optimal speech clarity. Superb sound whether using the leatherette or foam ear pad (both included) Noise canceling microphone Small, light-weight headset Extremely lightweight and comfortable Microphone, boom position and headband are all adjustable Single sided earpiece for grat flexibility