Anti-tyveri Case for bilnøgler Telefon Radio blokering Faraday Box Faraday Cage 20cm x 11cm sortAnti theft Case for Car Keys Phone Radio Blocking Faraday Box Faraday Cage 20cm x 11cm The case protects electronic devices against mechanical damage, but also has a number of other functions. First of all, it blocks the signal, making the phone out of range, has an anti radiation function and prevents demagnetization of data carriers and the loss of files stored on them. Specification: Size: 20 cm long and 11 cm wide Compatibility Due to its size,