The key chain design has a solid frame made of polished stainless steel that fits elegantly to the contours of the transponder. The key chain is waterproof, ultrasonically welded and is recognized by metal detectors.|In the RFID technology MIFARE® DESFire®, the key chain is available in the so-called speed version. With this version, the reading distance is greater than with a normal MIFARE® DESFire® key chain.|The serial number is printed on the key chain.