The Nady 100-channel select UHF wireless systems feature unsurpassed state-of-the-art performance with 120dB dynamic range and operation, up to 500 ft. (line-of-sight)100 user-switchable UHF frequencies per band, or automatic open channel selection with convenient auto-scan feature. The ASC (Auto-Sync Channels) download feature sends selected Group/Channel information to transmitter via IR sender for easy frequency synchronization and with front panel touch control buttons channel selection and ASC operation are a breeze.Other features include: tone squelch circuitry for protection from RF interference, DigiTRU Diversity for maximum range and dropout protection, AF level displays and folding dual antennas,front panel On/Off button (with Power On LED indicator); full LED indicators including A/B diversity, Group/Channel selected, ASC transfer status, and bi color (green/red), back panel balanced XLR fixed Mic Level and adjustable unbalanced ¼ Inches jack audio Line Level outputs; squelch (RF mute) adjust; DC input jack; volume control for ease of operation. Unit is externally powered with included DC adapter (15 VDC 400 mA). Rugged all-metal receiver designed for long-term durability. Choice of transmitters: UH-1K or UB-1K. Nady Systems has been designing, manufacturing, and marketing wireless microphones since 1976. One of the first wireless innovators, Nady has sold millions of wireless systems worldwide, and continues to provide some of the most innovative/ highest performing products on the market at the most competitive prices.