[netsharc]

A lot of times the machine would say "Use one card only", won't it? I have a Secrid wallet and I was expecting the aluminium to block the RFID reader except for the 1 card I put in the outer leather pocket, but I still need to open the wallet up and present the dangling card in its sleeve to stop multiple signals...

[newaccount74]

Blocking radio signals is harder than just adding some aluminium. I'm pretty sure most "RFID blocking" wallets don't actually block RFID reliably.

[Waterluvian]

I’ve seen error messages. But usually my Mastercard wins. I think it might just be faster to electrify.