Shure UR2 handheld transmitters are available in a wide variety of Shure microphone options and are built to withstand the most rigorous abuse. Part of the UHF-R Wireless system, UR2 systems feature Shure's patented Audio Reference Companding for crystal-clear sound beyond the limits of conventional wireless technology. The UR2 is available with six microphone choices, including the venerable SM58.