Card device for connection to a USB receptacle

1. A card device for connection to a USB receptacle, the card device comprising a substantially rectangular body formed from flexible material and including:

(a) electronic circuitry;

(b) a set of electrical contacts deployed on a surface of a first region of said body and electrically connected to said electronic circuitry; and

(c) at least one preformed fold line passing adjacent to said first region and defining a line for folding a corresponding second region of said body relative to said first region of said body from a flat state to a folded state,

wherein said set of electrical contacts and said at least one preformed fold line are configured such that, when said body is folded along said at least one preformed fold line, said first and second regions form a plug configuration sized for insertion into the USB receptacle with said electrical contacts positioned to contact electrical contacts of the USB receptacle, and such that a resilient bias of said second region to return to said flat state generates a contact force of said electrical contacts against contacts of the USB receptacle.

2. The card device of claim 1 , wherein said substantially rectangular body further includes at least one cut passing adjacent to said first region and defining an edge of said plug configuration.

3. The card device of claim 2 , wherein said preformed fold line extends substantially perpendicular to said cut.

4. The card device of claim 2 , wherein said substantially rectangular body includes two parallel cuts on opposite sides of said first region and defining edges of said plug configuration.

5. The card device of claim 4 , wherein said preformed fold line extends between, and substantially perpendicular to, said two parallel cuts.

6. The card device of claim 4 , wherein said parallel cuts do not intersect a periphery of said substantially rectangular body.

7. The card device of claim 4 , wherein said substantially rectangular body further includes a third cut such that said parallel cuts and said third cut together define a plug-forming region of said body inset from a periphery of said substantially rectangular body.

8. The card device of claim 1 , wherein said plug configuration defines a direction of insertion, and wherein said at least one preformed fold line extends substantially perpendicular to said direction of insertion.

9. The card device of claim 1 , wherein said plug configuration defines a direction of insertion, and wherein said at least one preformed fold line extends substantially parallel to said direction of insertion.

10. The card device of claim 9 , wherein said at least one preformed fold line includes at least two preformed fold lines, said preformed fold lines defining edges of said plug configuration.

11. The card device of claim 10 , wherein an entirety of said substantially rectangular body is folded along at least three substantially parallel fold lines to form said plug configuration.

12. The card device of claim 1 , wherein said substantially rectangular body has a thickness less than half a minimum effective thickness required for mechanical engagement with the USB receptacle.

13. A card device for connection to a USB receptacle, the card device comprising a substantially rectangular body formed from flexible material and including:

(a) electronic circuitry;

(b) a set of electrical contacts deployed on a surface of a first region of said body and electrically connected to said electronic circuitry; and

(c) at least one flexion region,

wherein said set of electrical contacts and said flexion region are configured such that, when said body is flexed at said at least one flexion region, said first region forms at least part of a plug configuration sized for insertion into the USB receptacle with said electrical contacts positioned to contact electrical contacts of the USB receptacle, and such that a resilient bias of said flexion region to return to a flat state generates a contact force of said electrical contacts against contacts of the USB receptacle.