This Nady U-41 QUAD wireless system is a professional 4-channel UHF wireless system which offers clear, natural sounding wireless with 4 bodypack transmitters and lavalier mics. The Nady U-41 QUAD receiver delivers four discrete channels in the 902-928MHz and 944-952MHz bands for interference-free performance in any application or locale. It 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 also features dual removable antennas. UB-4 Bodypack Transmitter The compact UB-4 Bodypack Transmitter is a convenient way to add a lavalier mic (included) to your wireless arsenal, though it can also be used with your instrument if you"d like to play wire- and worry-free. The locking 3.5mm mini-jack ensures a secure connection every time out. It has an Off/Standby/On switch for allows uncomplicated audio muting while the transmitter is on. Other features on this wireless mic system include a status LED indicator that flashes once for unit on or stays steady when the battery is low, easily accessible input level adjust control for optimum sound when using the lavalier mic, and the wireless system runs on a single 9V alkaline or NiMH battery.Nady wireless system includes: U-41 QUAD wireless receiver 4 UB-4 Bodypack Receiver with lavalier mics Nady U-41 QUAD Wireless Receiver 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) UB-4 Bodypack Transmitter Includes 2 lavalier mics 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 Locking 3.5mm mini-jack provides secure connection for removable microphone or instrument cable Easily accessible input level adjust control for optimum sound (HM/LT operating modes only) Uses a single 9V alkaline or NiMH battery