&gt; <i>I&#x27;d honestly be surprised if most products I own didn&#x27;t have one of those.</i><p>A barcode or an RFID tag? The only reason most of your products <i>don&#x27;t</i> have an RFID tag is that barcodes are <i>much</i> cheaper, and the entire logistics chain - from manufacturing to retail - is already pretty well optimized around those. There is not much value to gain. About the only use for passive radio tags I&#x27;ve seen widely deployed is theft prevention, and half of the times the tags are removed at the counter and later reused.