It truly blocks the key fob signal and keeps my phone safe as well. The outer pocket doesn't have the rfid blocking so I keep my house keys in there. I also purchased several of the celol phone jammer products to use for traveling and not a single one of them blocked the signal. I sent them all back and they were expensive! This device is worth every penny. It's so effective that even if the cover is even slightly closed and not velcro-tight, it still blocks the signal. I used it to replace the cheap bag provided with my toll transponder. Works well, good looking, and now I can keep it within reach in the car for when I need to put it up.