The DynaLock 7500 Series advanced standalone digital keypad incorporates a built-in 125 kHz proximity card reader, backlit metal keys, and a heater that automatically activates in frigid weather to prevent key freeze. Made by DynaLock of Bristol, Connecticut, the unit allows for up to 500 users with PIN and/or RFID credentials for access. A flexible power input allows the device to operate on direct or alternating current. Two SPDT relay outputs are provided in addition to request-to-exit and auxiliary inputs. The metal case is designed to resist weather and vandals.