CD 540
FRAMEWORK, entirely of steel, black enamelled.

MICRO-TELEPHONE. RE 4001, with cord RS 6000, suspended on a hook-switch.

CONDENSER, with a capacity of two microfarads.

RINGER. 1,000 ohms resistance.

The line terminals and a protector are enclosed in the instrument.

Overall dimensions
Height 20.00 inches
Width 9.65
Depth 6.90

Weight, 10.14 lbs.