2 3/8 INCH W X 3 1/8 INCH D X 3 3/16 INCH H SIZE; 60 HZ FREQUENCY RATING; UL 1585, CSA APPROVAL; 20 VA POWER RATING; LEAD WIRE TERMINAL TYPE; 120 VAC PRIMARY VOLTAGE; 27 V SECONDARY VOLTAGE; 20 POWER RATING IN VA; -20 TO 105 DEG F TEMPERATURE RISE