Interfaces and systems for displaying athletic performance information on electronic devices

Athletic performance monitoring system includes means for sensing the performance data and / or information to the user desired part. Electronic interface system facilitates performance data from the sensing system to display transmission equipment, for example, to achieve athletic performance data displayed on the display device in the electronics, the electronic display device includes a known and commercially available conventional electronic display devices (for example, mobile phone, PDA, pager, pager, MP3 or other audio players, radios, portable televisions, portable DVD players, other video playback devices, watches, etc.). Sensing system and any data transmission system associated therewith may be included as footwear, clothing items, sports equipment, etc. part, or even be included as part of the interface device. The portable system includes a sensor device housing, data transmission systems, data entry systems, interfaces, such as a display data output system. Output system includes means for releasably engaging an input port connected to the system of the portable electronic device.