A flash memory device includes a cover, an electrical module, a slider and a rotatable member for driving the slider. The cover defines a receiving chamber and an opening communicating with the receiving chamber. The electrical module is slideably received in the receiving chamber and includes a circuit board and a connector port electrically connected with the circuit board. The rotatable member has a fixed axis around which the rotatable member revolves. The rotatable member includes a protrusion slideably received in a slot defined in the slider. The connector port is driven to telescopically extend through the opening by the slider which is further driven by the protrusion.