It’s part of the Raspberry Pi3 board used to build the Stratux. It’s
not needed unless you want to hook your unit up to a display monitor
(Linux knowledge required) or repurpose it for another project.
Here's a video guide on setting up Avare. There's also a user forum with a dedicated Stratux section. Step by step guide from the forum: 1-In your Tablet / receiving device, make sure WiFi is ON. 2-Start your Stratux and wait until your device is ...