Designed to withstand the physical abuse of vandals. Access to the 130mm coaxial 2 way speaker requires the use of a security torx tool (T25), minimising unauthorised tampering and/or theft. Features an enclosed transformer & magnet providing superior protection from damage and debris. Suitable for use in prisons, train stations, bus stations, pedestrian malls, etc. Adjustable mounting bracket suitable for ceiling thicknesses from 4mm to 35mm.