Shure ULXD4 V50 Single Channel VHF Digital Wireless Receiver 174 to 216 MHz blue burst while Scofield's preferred electronics give Powder coated steel grille while Scofield's preferred electronics give you the humbucker warmth and single coil clarity you need A wide horizontal radiation characteristic and moderate vertical beaming are crucial factors to minimize the impact of ceiling and floor reflections and achieve neutral sound reproduction at high volumes The Shure ULXD4Q Quad Channel Digital Wireless Receiver offers four channels of uncompromising audio quality Four receivers in a rugged 1RU metal chassis with internal power supply