Shure BLX288/SM58 J11 Frequency Band Wireless Dual Microphone System (Silver)The Shure BLX288 SM58 Wireless Dual Vocal System provides the simple wireless setup and professional grade performance of BLX Wireless in a two transmitter and dual receiver set. Featuring two SM58 vocal microphones and one dual wireless receiver, the BLX288 SM58 is available in the regular black handheld with a gray grille. This wireless system works on a J11 frequency band. Superior Audio The Professional Shure sound for performance or presentation