Passive RFID trailer seals are used similar to the GPS systems but they are very small and compact which is simply inserted into the goods to find its location easily using satellites. This will not give any tamper evidence as it can just display the position of the goods in a two dimensional plane. This is a low cost solution for tagging and monitoring your stuff, Passive RFID Tags rely on ISO Certified RFID readers and antennas to provide the power to the tags so that they can be identified and the data stored on them can be read. Certified RFID tags have been tested and certified to work with Certified Readers or Antennas, but they may also be used with competing RFID solutions.  Should you choose to use a competing RFID reader or antenna with these tags, we can’t certify your results. We also offer Battery-Assisted RFID tags, which greatly increase the range in which they may be read.  Please contact your Certified Sales professional or reseller to review our current portfolio of Battery-Assisted RFID Tags.