The APG surface housings are designed to be used with the Alpha Communications / S.T.R.modular series door entry stations and system annunciators. There are seven (7) configurations available in single and double-width varieties.The APG housings are designed to be used in conjunction with the MT series Modular Frame(s). For larger configurations, multiple APG housings and MTframes may be mounted alongside each other. The APG surface housings are available in three (3) finishes to match the MT frame finishes; Titanium (suffix-T), White (suffix-W) or Brown (suffix-B).