Very good price vs the Parani so I bought one to test. The only thing I wish it had was it's own software for setup like the Parani. You have to use terminal software to configure it (windows HyperTerminal or Tera Term would be examples) You need to setup the baud rate with this
Otherwise, it can receive its power from pin 9 which lets you plug it directly into the serial port of the 500. Get Lance's NTRIP app on your phone, pair your phone with the BT device, a CORS network account if you do not have one already, and set your NTRIP settings into it. Voila, RTK
BTW, you should put some sort of location in your profile. For instance, myself, NW Ohio
Also, I added the instructions for the unit above that tell you how to change baud rate with terminal software.
Also, I forget exactly what settings need changed in the 500. Somewhere in the RTK settings you have to set the matching baud for your serial port.