Shure QLXD2/SM58 Wireless Handheld Transmitter – J50A: 572 – 608 / 614 + 616 MHz
J50A (572-608 + 614-616MHz). 145 dB SPL (SM58), typical. Shure SB900: up to 10 hours. The QLXD2/SM58 Handheld Wireless Microphone Transmitter works with QLX-D Digital Wireless Systems. Shure proprietary digital.