The Silencer Ear Buds have integrated Omni directional microphones and full dynamic range speakers that deliver a crisp clear sound while SAC (Sound Activated Compression) protects hearing. They utilize OS-R3110 Digital Sound Processing, feature independent volume control, and have an on/off power switch. Along with the advanced technology, Silencer incorporates the Secure Fit system, which includes three sizes of contoured fins and foam buds for a customized fit. FEATURES Left & Right Earbuds SAC (Sound Activated Compression) protects hearing OS-R3110 Digital Sound Processing Independent Volume Control On/ Off Power switch Integrated Omni Dir Mfg: Walkers Game Ear