lets us communicate wirelessly with other ESP8285 enabled devices using a protocol called espnow. We call this chip the TX-Backpack. The aim of the TX-Backpack is to allow wireless communication between ExpressLRS, and other FPV related devices for command and control, or for querying config.

Sounds interesting What type of FPV devices can it talk to?

A prime use case is your video receiver module (or VRX). Currently there arent many VRX modules that have an ESP8285 built in to allow them to communicate with ExpressLRS, so in most cases you need to add your own. A small ESP based receiver can be piggybacked onto your VRX module, which allows ExpressLRS to control the band and channel that your goggles are set to. We call this device the VRX-Backpack.

Wow cool, so Ill be able to control the module via ELRS!? Which VRX modules does it work with?

The list of supported modules can be found on the

wiki: https://github.com/ExpressLRS/Backpack/wiki

More information

https://github.com/ExpressLRS/Backpack

EP82 Backpack

MCU: ESP8285
Weight: 0.37gram
Size: 10.5mmx10.5mmx3.5mm