I don't know how useful is this but is cow robbery now a thing? HAHAHA, Not unless you have a market for this I don't think people will buy this stuff.

PROS :

• Option for you to have a collar for big animals when needed
• uses renewable energy

CON :

• Utterly useless farmers nowadays inject the cows, horses, and even dogs with RFIDs or Chips for tracking inside there body making the removal of the gadget impossible.