THE SMART WAY TO PROTECT YOUR CONTACTLESS CARDS - Simply place a single Attenuo RFID blocking card in your wallet or purse and you’re protected. No fiddling about with individual sleeves. No need to fork out for a new wallet or purse. You can carry on using your contactless cards as normal. Simple and effective. Every single card is tested before it leaves the factory guaranteeing its effectiveness. Any problems or questions, let us know and our UK based customer service team will help you out.