Aiphone IE-SS FL MT 2-Gang Sub Station, Stainless Steel - IESS. Stainless Steel Door Station-The IE-SS is a vandal proof and weather resistant sub station. It's constructed with 12 gauge stainless, a baffle protected speaker and limited stop call button. The unit either flush mount into a 2-gang box, or surface mount with the SBX-2G. The IE-SS includes tamper proof screws and a tool for installation