Product code: 1016970 Anti-theft cases for car keys Blocking radio waves - Faraday Box Faradaya cage. Necessary thing for car owners equipped with a wireless access system Keyless Go. The case protects electronic devices from mechanical damage, but also has a number of other functions: - Blocks the signal, making the keys out of the reach of the car - stops harmful radiation - Counterly discontinue data carriers and file loss - Due to your size, the case can accommodate car keys and small data carriers