Relcart ER-5900 Dual Channel Wireless Microphone SystemTuning Bandwidth:521.25MHz-936.85MHzRF Sensitivity:5dBμV, S/N>60dB at 25 deviationSquelch:10dB to 40dB, 5dB stepER-5900 series is a dual-channel true diversity wireless microphone. True diversity receiving mode is more stable, with AFS function,..