BLX288/SM58 - Wireless Dual Vocal System with two SM58 - Shure USA
Amazon.com: Shure BLX24R/SM58 Wireless Microphone System with BLX4R Rack Mount Receiver and BLX2 Handheld Transmitter with SM58 Mic Capsule, The Industry Standard for Vocal Performances - H9 Band : Musical Instruments
Amazon.com: Shure BLX24/SM58 Wireless Microphone System with BLX4 Receiver and BLX2 Handheld Transmitter with SM58 Mic Capsule, The Industry Standard for Vocal Performances - H10 Band : Musical Instruments