d only, Can not be programmed Works as a regular 125KHz RFID Card type: Standard EM card Chip: Tk4100 Compatible with standard EM ID access devices or ID reader Contactless transmission of data and supply energy Card material: ABS/PVC Detection distance: 2-10mm / 0. 08-0. 39" Color: Blue Each card pre-programmed with a unique ID number, first 10 digitals are printed on the card Application: Attendance, access control, identification, tag card Operating Frequency: 125khz Unique ID Number Compatible with all ID door access devise or readers Contactless transmission Size: 35mm (L) x 27mm (W) x 4mm (H) Weight: 4g each Water and weather resistant rfid tags rfid 125khz tag key fobs 125khz rfid tag key tags door lock rfid key tags Can't compatible with UHF reader and encrypted readers, for example, HID, Indala, Cobra, APCiK , Paradox, Radio, Honeywell, Kaba, Isonas, Infinias, etc.