(Made In ) The key fob signal is 100% blocked while your car key is in the closed box. No need to worry about your car being stolen. The shield box can accommodate many keys to protect all the car keys in your home. Compact, . Bring more peace of mind whenever you have to park the car outside or in a parking lot. You can sleep peacefully or enjoy your vacation. All of the car and smart keys are constantly sending out signals to detect each other. It is very useful to keep the car battery from draining