Adding a secondary receiver gives another layer of reliability and allows for different types of antennas to be used simultaneously so you can feel confident you are getting the best signal. Finally, a Fat Shark diversity module that works.
When plugged into the Main Module, the Diversity Module is automatically detected and ready to use without any firmware flashing.
Version 4 Diversity module is required with the v4 Main Module in order to utilize the speaker. If you choose not to upgrade your diversity module you will need to remove the speaker from the v2 or Lower Diversity module.