uAttend Compatible Proximity Badge Cards, 20 Pack (RFID 125 KHz Thin ISO 0.8 mm), Works with CB5000 / CB5500 / CB6000 / CB6500 / MN1000 / MN2000 Clock Models Proximity badge cards, Compatible with uAttend CB5000 / CB5500 / CB6000 / CB6500 / MN1000 / MN2000 time clock models 125kHz frequency RFID, White PVC Length 3.36 inches (85.47 mm), Width 2.12 inches (53.85 mm), Thickness .03 inches (.8 mm) 20 prox badges per pack, Pre-Encoded with badge number printed on the badge