So in the begging of the game claptrap says that they rebranded the “ECHO-2” as a Grenade and I don't think anyone took it seriously but it turns out he was right :
Use a Raspberry Pi to Build a Functional Borderlands Echo Device - Hackster.io
Anthony Eliott - Echo 2 Device - Borderlands 3
Borderlands 3 Change Echo Theme - YouTube
Borderlands 3 Unobtainable AMD Red Chipper Echo Theme/Skin, All Platforms ✓ | eBay
BBCW Distributors > Special Order > Borderlands 3 Prop Replicas - Echo Device