A connector assembly has a plug and socket; the plug includes an insulative body, at least one first power contact, at least one second power contact and a metal shield. The insulative body has a base portion and a tongue portion extending from the base portion. The tongue portion includes a plurality of power contact grooves and penetrates through the base portion, and at least one first convex portion defined in a periphery of the tongue portion. The first power contact and the second power contact are respectively formed on the power contact grooves of the insulative body for connection to a power source in a socket of host device. The metal shield encloses the tongue portion of the insulative body to cover the tongue portion. Consequently, the charging speed can be increased, reducing charging time.