Sinking type electrical connector and assembly of the sinking type electrical connector and a circuit board

An assembly of a sinking type electrical connector and a circuit board, comprising:

• a circuit board provided with a receiving recess and at least one positioning hole;
• and
• a sinking type electrical connector including:
• a body having a front end portion, a connecting portion provided in said front end portion, and a top surface;
• at least one insert piece which corresponds in number to said positioning hole, and which extends downwardly from said body for insertion into said positioning hole such that said body is received and positioned in said receiving recess;
• and
• at least one limiting unit provided at one side of said body and including a plurality of limiting portions respectively located at different levels, a selected one of said limiting portions of said limiting unit which are at different levels being brought to engage said circuit board so that a distance from said top surface of said body to said circuit board is changeable.