The AY-x12C with selectable output formats (Clock & Data or Wiegand 26-Bit) reduce stocking costs, while offering various control options such as hold, buzzer and multi-LED color control. The units are designed for easy mounting with hidden screws (security screws may be used to enhance strength). Optical tamper adds protection against wall removal, and the buzzer adds audible RFID card read notification. LED control provides system based information to the end user.