Abstract: Presented is a device for transmitting data, for storage and use, to small electronic devices without need for additional devices being incorporated into one the communicating devices. Data is transmitted from a second device a to a first small electronic device. In transmitting the data, the second electronic device encodes the electronic data for sonic transmission. This is done by preparing a sound generating file that then drives the speaker of the second electronic device. A microphone of the first electronic device receives the sound waves/frequencies and then decrypts them into digital form. In a less preferred embodiment, the first electronic device may also encrypt electronic information for sound generation to drive the speaker of the first electronic device. Then, the microphone of the second electronic device receives the sound and decrypts it into its digital form and stores the decrypted information into a memory location.

Abstract: Presented is an attachment having a keyboard that is useful for expanding the data entry capability of pen-based computer devices or PDA's. The attachment comprises two basic sections, a keyboard section and an attachment section. The attachment section comprises an attachment enclosure having an I/O connector located within the attachment enclosure. The attachment enclosure is generally in the shape of an open-ended box or rectangular prism. In a preferred embodiment the attachment enclosure closely matches the size of the PDA such that the PDA is securely, but removable, contained by the attachment enclosure. Since there are a variety of differently shaped PDA's on the market, there may be a variety of differently sized attachment enclosures, each of which will have at least one open end and the I/O connector located within.