ValuProx 125kHz + MIFARE EV1 1K 13.56MHz PVC Cards provide flexibility and allow you to do more with your cards . Featuring standard 125kHz prox and genuine NXP MIFARE EV1 13.56MHz technologies, you can upgrade door access systems as needed without having to replace every reader in your system. Both sides of the multi-technology cards offer a graphic-quality glossy surface, which may be printed with any dye-sublimation card printer for professional-looking credentials.