In use, the lid is secured to the wall or other surface using the slots moulded into the integral flanges. The screws securing the lid to the base are then inaccessible as they are against the surface, giving security against unauthorised tampering. For maximum security, the units can be attached to the wall with tamper-resistant screws. Standoffs are moulded into both the lid and the base and, apart from in the two smallest sizes, DIN rail mounting tabs are also provided. The bottom of the base features a moulded recess for a membrane keyboard or label.
The initial six sizes range from 120 x 66 x 42mm to 159 x 91 x 62mm; all lids are fitted with captive M4 stainless steel screws that engage with stainless steel inserts in the base, allowing repetitive assembly and disassembly. Environmental sealing is achieved through a tongue and groove design and a moulded silicon rubber gasket; all fixings are outside the gasket seal.