The three-wire surveillance kit consists of three modular components: a microphone, a PTT switch (various options available) and an earset. This allows the user to position the microphone to best fit the immediate need, i.e. transmit user's voice or pickup nearby conversations. Because each component is modular, they can be changed easily. In fact, the three-wire system is the industry's only surveillance kit that quickly converts from a three-wire to a two-wire system as the situation dictates.

Ear hanger, and ear insert are standard.

Coiled tube and open earmold can be purchased as accessories.