A Low-power flash-memory device uses a modified Universal-Serial-Bus 3. The top surface has a circular side view profile that extends from the front end to the rear end and is contiguous with finger buttons on the mouse. The modes may include a constant-current mode suitable for applications such as battery charging and power LED lamps, and a constant-voltage mode suitable for a variety of conventional uses such as powering electronic circuitry. The dummy bit-lines are maintained in a floating state. Respective contacts are connected to the first and fourth semiconductor layers.