Included: BLX4R single channel half-rack wireless receiver with rack mount kit; BLX2 handheld transmitter with integrated SM58 cardioid dynamic microphone capsule; microphone clip; PS23 power supply and WA621 color id caps (optional accessories). SM58 with BLX2 Handheld Transmitter Compatible with Shure microphones trusted by musicians for decades, including the legendary SM58, the BLX2 transmits wireless audio with professional clarity and reliability. BLX4R Single Channel Half-Rack Receiver The BLX4R is a rugged, metal rack-mountable receiver with simple set-up and intuitive controls. One-touch QuickScan frequency selection quickly locates the best frequency, while removable antennas allow for quick antenna distribution. Rack mount kit included. Available in four frequency ranges: BLX H8 (518-542 MHz)BLX J10 (584-608 MHz)BLX K12 (614-638 MHz)BLX M15 (662-686 MHz)