ISK3 Brushed Chrome Compoint Door Station . Weatherproof call station fits a single-gang deep wall box. Plated die-cast zinc cover plate mounts flush to exterior wall. Internal microphone with automatic gain control. Built-in amplifier and speaker. 110 punch-down connector for CAT-5 cable. Internal relay with screw terminals for connecting to an external doorbell. Amber-backlighted call key. Brushed Chrome.