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This audio jack is similar to the TRS Phono Plug, with the exception that there is an additional ring, resulting in a Tip + Ring + Ring + Sleeve configuration. The TRRS phono plug facilitates the addition of another connection since there are 4 contact places on the jack separated by three insulation layers. The two most common applications today for the TRRS phono plug in Mini Phono is for video camera recorders and mobile audio devices including the iPod, iPhone, and Android phones.This audio jack is similar to the [[TRS Phono Plug]], with the exception that there is an additional ring, resulting in a Tip + Ring + Ring + Sleeve configuration. The TRRS phono plug facilitates the addition of another connection since there are 4 contact places on the jack separated by three insulation layers. The two most common applications today for the TRRS phono plug in Mini Phono is for video camera recorders and mobile audio devices including the iPod, iPhone, and Android phones.[[File:trrs-motoroladroid.png]]<BR>Some Androids use the iPod convention, while others use the original Nokia convention. Early Motorola Droid phones used the original Nokia convention. It is unknown if the newest Motorola Droids use the same.[[File:trrs-motoroladroid.png]]<BR>Some Android smartphones use use the original Nokia convention. Early Motorola Droid phones use the Nokia convention. It is unknown if the newest Motorola Droids use the same.Then along came Apple with their iPod and iPhone audio devices. Rather than accepting an existing convention, Apple created chaos for device manufacturers by swapping the microphone and ground connections. Standard TRS audio plugs should work fine in these devices for audio playback from the Android phone to a stereo receiver. Shorting the microphone and ground doesn't seem to harm the device for most phones with the Nokia TRRS jack. Along came Apple Computer Company with their iPod and iPhone audio devices. Rather than accepting an existing convention, Apple created chaos for device manufacturers by swapping the microphone and ground connections. Think different?[[Category:Mobile Phones]]