This Chassis controls up to 4 RJV 12×1 modules, 6×4 modules, 4(1×2) modules or specialty modules. Add Switch Modules to complete the system.

Dimensions: 19″ Rack Mount (483 mm) 15″ deep (381 mm) 5.25″ (3 RU) high (134 mm)
Weight: 20 to 30 lbs (9 to 13.6 Kg) max AC Power : 50 Watts max. 110/220 selectable.

link to switch module selector