The Nady U-41 QUAD handheld wireless system is a professional 4-channel UHF wireless system that offers clear, natural sounding wireless with 4 rugged UH-4 handheld transmitters. The Nady U-41 QUAD delivers four discrete channels in the 902-928MHz and 944-952MHz bands for interference-free performance in any application or locale. The wireless system also features Nady"s proprietary companding and low noise circuit for a 120dB dynamic range. The back panel has balanced XLR mic level outputs, an unbalanced 1/4" jack line level sum output with separate volumes, and external adjustable mute control for each channel. On the front panel, the LED display indicates TX On (single LED) and 5-segment AF levels for each channel. The Nady U-41 wireless mic system also features dual removable antennas. The Nady UH-4 handheld transmitter features a DM-10D unidirectional neodymium dynamic cartridge for optimum true sound, maximum feedback rejection, and minimal handling noise. It features an Off/Standby/On switch which allows convenient audio muting while the UH-4 is on. A status LED indicator flashes once when the wireless system is on, and stays steady when the battery is getting low. The wireless mic system runs on a single 9V alkaline or NiMH battery.Four discrete UHF wireless receivers in a single rugged 19" all-metal rackmount housing for simultaneous operation of up to four transmitters Back panel balanced XLR mic level outputs; unbalanced 1/4" jack line level sum output with separate volumes; and external adjustable mute control for each channel Front panel LED display indicating TX On (single LED) and 5-segment AF levels for each channel Dual removable antennas Nady"s exclusive patented companding circuitry and highest quality audio for an unsurpassed UHF performance with 120dB dynamic range Operates on the UHF frequency band from 796.30MHz to 803.30MHz Tone Squelch circuitry for protection from RF interference Externally powered with DC adapter included (16.5VDC/0.4A) UH-4 Handheld Microphone Transmitter: Features the Nady DM-10D unidirectional neodymium dynamic cartridge for optimum true sound, maximum feedback rejection, and minimal handling noise Off/Standby/On switch allows convenient audio muting while transmitter on Status LED indicator flashes once for unit on; lights steady for low-battery alert Single 9V alkaline or NiMH battery operation