Abstract: A system for playing audio recordings includes a transmitter configured to separately encode and transmit each of a plurality of components of an audio recording to a plurality of receivers each configured to receive and decode one of the encoded components of the audio recording. In another embodiment, a method for playing audio recordings includes encoding each of a plurality of components of an audio recording, assigning each of the plurality of components to a specific receiver, transmitting each of the encoded components to the assigned receiver, decoding each of the encoded components and outputting each of the decoded components.

Abstract: A protective case for a mobile device includes at least one speaker and first and second wireless communication modules for first and second wireless communication protocols. In some embodiments the case includes a battery. In some embodiments the case in the case includes a sliding interface for connecting the case and mobile device. In some embodiments the case includes at least one ambient light device. The wireless interfaces of the case allow connection between multiple cases such the one case can broadcast a signal to multiple cases.