An electrical connector for mounting to a print circuit board includes an insulative housing, a metal shell shielding around the housing and a plurality of terminals received in the housing. Each terminal having a body section and a contact section extending from the body section, the housing includes a first housing and a second housing, the body section being received in the second housing and the contact section extending from the second housing to the first housing. The first housing has a first dielectric constant and the second housing has a second dielectric constant higher than the first dielectric constant so as to prevent the characteristic impedance change.