https://www.scmsinc.com/lectrosonics-dssm-b1c1-mini-water-resistant-digital-wireless-transmitter-537-to-662-mhz.html
Lectrosonics DSSM-B1C1 Mini Water-Resistant Digital Wireless Transmitter (537 to 662 MHz)
Revolutionize your audio recordings with the Lectrosonics DSSM-B1C1, featuring long battery life, robust construction, and flexible input options.