a low profile design of multi - in - one card connector includes a base frame having two upright sidewalls and a guide groove at the front side of each upright sidewall and defining a front insertion opening , multiple terminal sets mounted in the base frame , two limiter blocks vertically movably mounted in the guide grooves of the upright sidewalls each having a top stop flange and a bottom stop flange , at least one of the top and bottom stop flanges of each limiter block being held in the front insertion opening to prohibit insertion of a second memory card after insertion of a first memory card , and two elastic members supporting the limiter blocks in an upper limit position .