GTD Audio G-733L 2x800 Channel Diversity UHF Wireless microphone mic system True diversity operation for increased range/reliability, reducing dropouts Built-In Tone Lock Squelch circuit protection from RF interference Automatic frequency scanning to find and set the best available channel Automatic transmitter setup, the channel of the transmitter and receiver can easily synchronize Range: up to 600 Feets ( 200 meters ), Frequency: UHF 550MHz - 590MHz