AC Series Mullion/Gang Box Combo Proximity Reader - The AC-PROX-1G is a 125 kHz Wiegand proximity reader designed for single-gang and mullion mounting. Up to 6" non-contact read range with clamshell card. It can read Aiphone 40-bit credentials, certain HID, AWID, and Pyramid credentials. Mounting has horizontal and vertical mounting slots, which allow the reader to be adjusted and leveled.