China RFID Blocking Card for Protecting Your ID and Credit ...
3- How many credit cards can be protected with one blocking cards . Our RFID Blocking cards protect field is 720°, 3D protection. This fieild is about 2-5cm for normal. So if cards are placed together, blocking cards can protect about 5-10pcs. cards. (The working type of RFID Blocking cards is same as RFID products. It is Passive.
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