These RFID tags operate at 125KHz and are suitable for MOD-RFID125 and MOD-RFID-125-BOX. They come in different shape and have different reading distance, generally the bigger is the tag bigger reading distance it have. FEATURES: • EM4102 64 bit Read only tag • Operating Temperature -40 °C ~ +85 °C • Relative Humidity 5% to 90% non-condensing • Operating frequency 125Khz