These are all the Echo Devices we've seen across the Borderlands games so far. Weird to think that before BL3 those others were also canonically responsible for projecting your menu. 3 actually
Anthony Eliott - Echo 2 Device - Borderlands 3
Getting The Ultra Rare Echo-2 Grenade Mod (Stream Highlights) - Borderlands 3 - YouTube
Echo | Borderlands Wiki | Fandom
Borderlands 3 - The Search For The Elusive Echo-2 Grenade Mod (Stream Highlights) - YouTube