8 selectable frequency-coordinated UHF channels. Use up to 8 simultaneous systems - all channels compatible. * Automatic frequency scanning. Tone Lock squelch system eliminates interference when transmitter is off. * LED Channel display plus Antenna, AF Peak indicators. Balanced XLR and unbalanced 1/4" output connectors. * UniPak transmitter features: separate guitar/mic trim control, switchable high/low RF power, internal channel selector, multi-color battery/power indicator, AA operation. * Pro Series 5 body-pack systems are compatible with all Audio-Technica Wireless Essentials microphones and cables.