The pre-set group of channels in the Telex FMR-500 allows upto 20 systems to work simultaneously within 3 bands or up to 10 within 1 band. The 1122-Channel Frequency Agile system with Auto ClearScan, in this Telex Professional Microphone offers automatic group and channel selection with easy system setup. The Digital Posi-Phase Diversity receiver technology in this Wireless Microphone System provides maximum range and clear audio. This Telex Professional Microphone has a balanced XLR audio output for microphones including a 1/4 inch unbalanced line output to match any application. The Backlight receiver LCD display in this Wireless Microphone System projects battery status, channels, frequency, RF and Audio level meters. The Telex FMR-500 includes single and dual rack mount hardware with front mount antenna cables for convenience.