ONEVER Faraday Box and Upgraded Faraday Bag for Key Fob (2 Pack), TICONN Premium Faraday Cage Protector is what we bought from Amazon. I can attest it does work. After two weeks, I can’t confirm. We originally used the little bags and opted for the box to easily throw the keys into when at the house.I've been trying to find a bag to use for this and so far most of the reviews say it stops blocking the signal after a few weeks. so what are others using and can attest that they continue to work.