Rosslare Security ME00 9 Boards Tray Cabinet Housing - Metal enclosure with lock, holds up to 9 standard Expanse boards providing an easy way to set up large systems using the built in interconnect backbone. With one MU and eight EU's one enclosure can support up to 16 doors. A built in universal switching power supply provided to power all boards and the backup battery charging circuit. Space provided for two 7AH or one 14AH, 12V lead acid batteries (Sold separately).