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A final layer of complication involves the use of voltage fluctuation device control schemes to manipulate audio devices such as skip, play, or pause the playback of music on an iPod or iPhone from a hands free device. Both Android and Apple devices have music control via the phono jack. The Tip and first ring are not impacted. Control is typically accomplished by voltage applied to the microphone connection, which is sleeve on some Android devices. Incompatibilities exist between Android systems, Apple iPhone systems, and 3rd party manufacturers. This is mostly the fault of Apple for refusing to utilize an existing convention.=== Video Devices ===