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<p>[QUOTE=&quot;calcol, post: 4614671, member: 77639&quot;]There are lots of wireless transponder options.&nbsp; There&#039;s no need to use one that can be read from feet away on a credit card ... and good reasons not to.&nbsp; But there are ones that have a much further reach.&nbsp; For example, the FasTrak transponders in cars in the Bay Area (used for bridges and toll lanes) can respond 25 ft away and can communicate fine when the car is going 70 mph.</p><p><br /></p><p>If your phone has blue tooth, wifi and cell capabilities, it has transponders that operate at about 15 ft, 100 ft and 5 miles.</p><p><br /></p><p>The decision of what type to put in a slab will not be easy.&nbsp; Lots of things to consider: complexity of processor, memory, range, antenna size, frequency, power consumption, etc.</p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>

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