Dual-port electrical adaptor

An dual port adaptor comprising:

• a case defining a receiving space and defining two opposite ends along a front-to-back direction and a middle levels in a vertical direction perpendicular to said front-to-back direction;
• a single port located at one end of the case for input;
• a dual-port located at the other end of the case for output;
• a pair of printed circuit boards being received in the receiving space and spaced from each other in said vertical direction;
• a pair of rotatable wheels located respectively at said middle level in said vertical direction and partially exposed respectively outside two opposite lateral faces of the case in a lateral direction perpendicular to said front-to-back direction and said vertical direction so as to easily allow the user to adjust corresponding resistors which are respectively located inside the case at said middle level and respectively mounted upon the printed circuit boards and respectively linked to the corresponding rotatable wheels;
• wherein
• the printed circuit board is offset from the corresponding rotatable wheel in said vertical direction.