It reads content of RFID tags. Once you have the content, you can write it onto another tag and essentially duplicate the key. Some tags are easier to read tha

It reads content of RFID tags. Once you have the content, you can write it onto another tag and essentially duplicate the key. Some tags are easier to read than others. But so far, with a bit of digging around the net, I've been able to read various key cards and copy them.