The SR420 from AKG is a wireless stationary receiver featuring a frequency band of 530.025 - 559.000 MHz and a tuning range of up to 30 MHz allowing the use of up to 8 channels simultaneously. The detachable antennas allow the use of professional accessories, such as antenna splitters and remote mounted directional antennas for multi-channel systems. The SR420 includes an audio clip and RF control LED for easy monitoring of your performance, and an adjustable squelch level for secure audio transmission in all environments.