Nady 401X-QUAD-HT A/B/D/N 4-Channel Professional VHF Wireless Hand-Held Microphone System with Frequencies A/B/D/N, 171.905MHz, 185.15MHz, 209.15MHz, 197.15MHz 401-HT receiver with 4 hand-held microphones with transmitters Four independent VHF receivers in one convenient, rugged, all-metal single rack space housing allows operation of 4 wireless systems at the same time Front dual antenna jacks for either onboard or remote antennas Off/Standby/On switch allows audio muting the transmitter while maintaining signal integrity Individual channel XLR output jacks, volume and RF mute controls on rear panel