Starting from 1999, we have gathered over 20 years of experience in working with RFID technology, during this time we have come a long and interesting way in the implementation of RFID systems for various purposes. Using almost all available types of RFID chips from the most widespread LF, HF and UHF up to 2.4GHz and applied them in various projects like: time attendance, marking of military uniforms, transport of blood components, access control, in almost all areas where this technology is applicable.