Audio Technica Pro Series 5 Lavalier Wireless System: * 8 selectable frequency-coordinated UHF channels * Use up to 8 simultaneous systems * Automatic frequency scanning * Diversity operation for increased range/reliability * LED channel display plus Antenna, AF Peak indicators * Balanced XLR and unbalanced 1/4" output connectors * Tone Lock squelch system eliminates interference when transmitter is off * Separate guitar/microphone trim control * Switchable high/low RF power * Internal channel selector * Multi-color battery/power indicator * Variable trim control * Internal channel selector * Compatible with all Audio Technica Wireless Essentials microphones and cables * Includes PRO-R500 receiver, PRO-T501 transmitter, omnidirectional lavalier microphone and system storage case