The Audio-Technica System 8 handheld wireless systems are designed for reliable performance, easy setup and clear, natural sound. These single-channel, fixed-frequency systems are available in three traveling VHF frequencies to choose from (169.505, 170.245, and 171.905 MHz). Durable construction, an advanced dipole antenna system for extended operating range as well as Power, RF, and AF Peak indicators on the receiver give visual indicators of the systems performance, not to mention volume control, 1/4" output jack and user-adjustable squelch. The handheld transmitter features a rugged, unidirectional dynamic microphone element with variable microphone trim control and multi-color battery/power indicator. Transmitters use AA batteries for superior battery life.