Must be Certified / Enclosure for up to Four RM modules, i.e. Two RM-4E and Up to Two I8 or Two R8 Boards, UL listed. 356x305x89 mm (14x12x3.5 in) with lock and tamper switch. Enclosure can fit up to four modules, mix and match, with two mounted on the door and two mounted in the rear of the enclosure.