D Debra Audio AU400 PRO UHF 4 Channel Wireless Microphone System with Cordless Debra Audio AU400 4 channel wireless microphone system. (Two set freuqncy point: A- 501/511.5/524/538.5 B-506/517.5/531/546.5) There series products adopt UHF frequency and use the international standard common frequency which can be used in all over the world. Due to the low frequency […]... Read More