MIPRO ACT-311/ACT-30T Single Channel Bodypack Wireless System with Lavaliere Microphone EIA standard 1/2U metal receiver. Backlit LCD displays group, channel, frequency, RF level, antenna selection, AF level, battery level indicator, interference warning indicator, and panel lock indicator. Advanced diversity technology for optimum reception range and reduces signal dropouts and the "PiloTone & NoiseLock" dual-squelch circuits prevent noise interference Industry's only RF interference warning indicator for ideal SQ level adjustment. Frequency Range: UHF 542~590 & 904~928 MHz