This compact, lightweight unit picks up sound through bone vibrations in the ear canal. This small black earholder secures the ear microphone in the ear. The miniature earpiece leaves the hands free and face unobscured, and is perferct for security personnel that must retain the ability to help, hear and speak directly to those not on the communication system. Ear Microphone Systems (EMS) may be worn with protective masks without any reduction in clarity of sound. It’s ideal for high noise environments.