Debra Audio TD-220 is true diversity dual microphone four receive and antenna, effectively overcome the frequency of dead ends, UHF band, PLL digital frequency synthesis. The Optimal distance arrived 850 Foot operation range. Infrared frequency, the transmitter can be interchangeable, simple operation, advanced features.200 frequency points so that you can use 100 set at the same time, so that you don't need worry the frequency interference. High sensitivity to meet the outdoor distance to meet the performance requirements. Our product use top microphone cartridge/core match the latest optimized circuit board, so that it can fully restore your voice. This microphones system that can be satisfied with most profession or person use. If you want the good various performance, show, lectures, singing, it is your best choice for you Debra Audio TD-220 wireless microphone system comes with 3-year warranty & supportive customer service.