I know we all try to do everything we can so that the key FOB works, but I had a need for it NOT to work. Sometimes when I go out running or climbing, I want to leave the FOB in the car, yet I also don't want someone to steal the car. Plus, my wife likes to leave her purse in the car sometimes, and it seems regardless of where we put it, frunk, backseat, trunk, the car will still open because the key is in the car. Queue my homemade FOB sarcophagus.... 3d printed and then lined with aluminum foil. It also has the plate from the Scosche magnet mount so I can keep it out of prying eyes. Although, now that I think about that, I could have just thrown it under the seat.... Oh well. Signal from the FOB is completely blocked, even when placed directly on the windshield spot.