Shure SLX2/SM58 Handheld Transmitter with SM58 Microphone, J3 For this wireless system component to work, please make sure your transmitter and receiver match in frequency range (style) SM58 Cardioid Microphone Unidirectional dynamic cardioid mic50 to 15,000 Hz frequency response Legendary Shure quality, ruggedness and reliability Backlit LCD with timeout feature The SLX2/SM58 Handheld Wireless Microphone Transmitter works with SLX Wireless Systems.