Can you read this? 

QR Codes are 2 dimensional barcodes that are easily scanned using any modern mobile phone. This code will then be converted (called "dequrified") into a piece of (interactive) text and/or link. For instance, you walk around in the city and notice a poster for an event that seems interesting. You take out your mobile phone, scan the QR Code and will instantly get more information and a link to a website where you can book your tickets. You don't have to type or remember anything and because QR Codes can be very small, this saves a lot of space on the product as well.

Just another unique way to communicate your marketing message to your target market at a trade show event.  These are easy to create - just do a google search on QR Code generators!