The ERP-S is a combination of a high security 4-channel transmitter and a proximity tag which is ideal for automated doors and gates, public or private access, residential or industrial environments. Its innovative, robust and elegant design makes it perfect for internal or external use. The VRE is also optionally available as a 4-channel single transmitter (ER) or Mifare® tag (ERV). This product is compatible with all CDVI receivers.