The Lectrosonics DSR4EXTUSB is a bottom plate adapter for the DSR4 four-channel digital slot-in receiver that adds USB-C functionality, allowing you to use Lectrosonics' Wireless Designer software for monitoring, channel setup, scanning, and frequency coordination. The plate also provides two external audio outputs via TA5M connectors and a 4-pin Hirose DC jack for power. Firmware updates must be done with the micro-USB connector on the top panel of the unit. A power cable is not included.