An electronic card includes a housing, a plurality of contacts retain on the housing and a slider movably retained on the housing. The housing has a mating surface. The contacts are arranged in two rows along a length direction of the housing. Each contact in a first row has a flat first contact portion exposed to the mating surface. Each contact of a second row has a raised elastic second contact portion behind the first contact portion. The slider can move along the length direction of the housing to drive the second contact portions alternatively hiding below the mating surface or protruding out of the mating surface.