These chassis control up to twelve 8×1 or 4×2 modules, and can hold up to six 8K modules. One Control Module and twelve CP8 Relay Driver / Display Modules are included (one per switch module to give you LED indication of switch status on the front panel). Add Switch Modules to complete the system. Keypad Manual Control with LCD display or Pushwheel Manual Control are optional.

Dimensions:
19″ Rack Mount (483 mm)
15″ deep (381 mm)
7.0″ (4 RU) high (90 mm)
Weight: 20 to 31 lbs (9 to 14 Kg) max
AC Power : 125 Watts max. 110/220 selectable.

link to switch module selector