A connector is mountable on a circuit board and mateable with a mating connector along a mating direction. The connector comprises a contact, a housing, an enclosing portion and a coupling portion. The housing holds the contact. The enclosing portion encloses an outer circumference of the housing in a plane perpendicular to the mating direction. The coupling portion directly or indirectly couples the enclosing portion with the housing so as to allow the enclosing portion to move along the mating direction relative to the housing.