Brivo ACS6100 Large Expansion Can – 8 Board Capacity with Dual Power & Battery BackupBrivo ACS6100 Large Expansion Can with Power Scalable, enclosure based expansion for Brivo ACS systems. The Large Expansion Can accommodates up to eight (8) ACS6100 expansion boards and includes integrated backup power for controller expansion electronics. Key Features Holds up to 8 ACS6100 expansion boards Large, lockable steel enclosure for secure installations Two internal power supply boards for controller expansion power High capacity 12V 28Ah