Options for acoustic loop. Intercom firefighters POMP V2F BSP2

dem POMPV2F comes with housing type BSP2 for surface mounting. Intercom firefighters to call cabin/machinery (Standard 81-72). For surface embedded in thin wall. Voice communication priority - level firefighters cabin (additional contact for machinery). Is connected by two son at MACH V2. Provide a 12V-type BAS 1210. Stainless steel front 2 mm (dimensions: 253 x 83 mm - depth 48.5 mm). Former reference: POMP-V2F-BSP2