Ska Direct 100% Anti-tracking Anti-spying GPS Rfid Signal Blocker Pouch Case Bag Handset Function Bag for Cell Phone Privacy Protection and Car Key FOB - (Black) High quality and perfect design, Can be used as a wallet at the same time Anti-radiation,anti-degaussing,anti-signal Prevent people from being tracked with this bag,Protect your privacy If you don't want to answer the phone,you can put the phone in the bag,then the phone will tell "Calls can not be connected." Size: 3.5 x 7.2 x 0.4 inches.