Abstract: A portable USB device built with rechargeable functional apparatus is disclosed. The portable USB device has a USB connector for being inserted into a socket of a host device. A USB device module is powered by the +5V pin on the USB connector and activated to perform data exchange via the D+ and D− pins on the USB connector when the USB connector is coupled to the host device, so as to provide a first specific function to the host device. A charge circuit charges the rechargeable battery via the +5V pin when the USB connector is coupled to the host device. A functional apparatus is powered by the rechargeable battery so as to provide second specific function different from the first one when the USB connector is not coupled to the host device.

Abstract: An enhanced electronic card structure includes a circuit board, a top cover board, and a bottom cover board. The circuit board has multiple front front and rear contact points. At least one fixing hole is defined between any two adjacent front contact points. The top cover board has a front edge defined therein multiple gaps, each aligned with one front contact point and corresponding rear contact point. Any two adjacent gaps are separated by a rib, each rib having a bottom face extended thereform a fixing tip aligned with the fixing hole. The bottom cover board has a surface formed thereon multiple fixing joints, each aligned with one fixing tip at the bottom of the rib, so as to make the fixing tip pass through the corresponding fixing hole to be fixed to the corresponding fixing joint.