Shure ULXD2/SM87 Digital Handheld Wireless Microphone Transmitter with SM87A Capsule (X52: 902 to 928 MHz)FEATURES Still running analog wireless? Jump into the digital realm with the Shure ULXD2 SM87 handheld wireless transmitter. With an extended 20Hz 20kHz range and exceptionally flat response gives you clear, precise, and accurate low end and transient response. The legendary SM87 vocal mic capsule is used on the Shure ULXD2 SM87 handheld wireless transmitter, giving you one of the most well known mic sounds in the world. A rugged metal housing ensures