A wireless data processing module for use with a portable audio or video player. The module connects to the expansion port connector on an existing player which provides an interface port for exchanging data and control signals between the auxiliary module and the player. The module includes a radio receiver for receiving data signals from a wireless data transmission network that are temporarily stored in a cache memory. A controller responsive to operating commands accepted from a user interoperates with the player to selectively play program content that is persistently stored by the player and to render selected data signals in the cache memory in an audible or visual form perceptible to said user, thereby supplementing the content available to the user with recently produced content provided via the wireless network.