ADJUSTABLE HEADBAND:The sturdy yet lightweight stereo headset has a broad range of adjustment. Ultra-soft foam ear cushions provide hours of comfort ROTATING MICROPHONE : The boom mic can rotate 180° to be worn on the left or right and tucked out of the way when you’re not using it. The flexible mic can be positioned to capture your voice better and reduce background noise NOISE CANCELLING MICROPHONE ON EITHER SIDE:Wear it on your left or right side and rotate it out of the way when you are not using it. Plus, it cuts background noise - which means crystal clear calls with, family, friends and work.. Sensitivity (headphone): 122 dB +/-3 dB. Sensitivity (microphone): -44 dBV/Pa +/- 2.5 dB STEREO SOUND : Enjoy full stereo sound for crisp, clear voice and video calls, music, games and more. These are essential stereo headphones with microphone for either personal use or the office IN-LINE CONTROLS : Convenient and simple in-line controls on the headphone cord let you adjust the volume or mute calls without disruption PLUG AND PLAY COMPATIBILITY : The H151 headset works with common calling applications across almost all platforms and operating systems ADJUSTABLE HEADBAND:The sturdy yet lightweight stereo headset has a broad range of adjustment. Ultra-soft foam ear cushions provide hours of comfort;ROTATING MICROPHONE : The boom mic can rotate 180° to be worn on the left or right and tucked out of the way when you re not using it. The flexible mic can be positioned to capture your voice better and reduce background noise