The IS-SSR-2G is a 2-gang, stainless steel, flush mount, audio only door station with a red mushroom call button for use with the IS system. It is vandal and weather resistant and connects to the IS-CCU, IS-SCU, or IS-RCU using CAT-5e/6 cable. The unit has a built-in dry contact for door release (24V AC/DC, 500mA). There is also a contact input on the station that can be used for connecting to a secondary call button. Power for the IS-SS-2G is provided by the exchange unit through the wire.