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<p>[QUOTE=&quot;calcol, post: 25367751, member: 77639&quot;]Few corrections.&nbsp; The usual implementations of NFC, like used by PCGS, use inductive coupling for communication.&nbsp; The “waves” are magnetic, not electromagnetic (i.e. not RF).&nbsp; Typical range is less than 2 inches.&nbsp; And the slab is not continuously transmitting.&nbsp; It has to be near a transceiver like a phone in order to transmit.&nbsp; The inductive coupling is not only used for communication, but also for power.&nbsp; The phone acts as the primary side of a transformer, the slab as the secondary side.</p><p><br /></p><p>The biggest risk of theft of a parcel is not whether it contains a NFC chip but the old fashioned things like address of sender, value stated on the package (if it’s there), and random theft.</p><p><br /></p><p>Those concerned about security of a chipped slab, which can be legitimate in some circumstances, can use aluminum foil or any other metal covering.&nbsp; Or keep it in a container where it is no closer than 2 inches from the wall.</p><p><br /></p><p>Visual security devices can be easily copied.&nbsp; And the average collector probably isn’t familiar with the finer points of the visual security devices on slabs.&nbsp; Lots of fake slabs on eBay and elsewhere, and the slabs are very close in appearance to the real thing.&nbsp; Properly done, a chip is very difficult to duplicate.</p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>

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