Audio-Technica ATW-2120a Wireless Handheld UHF System in Band I - Ideal for Singers and Presentations - with: Sennheiser HD 202-II Headphones and On Stage MS7201B Round Base Microphone Stand This system operates on Band I / 487.125 to 506.500MHz Automatic Frequency Scanning, this will search for the frequency that is available in the area Tone Lock Squelch System fights interference Rugged metal half-rack receiver with soft-touch controls and LCD display Clear sound quality and rock-solid, dependable performance