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The blue wire of the power cable is used for the ignition sense feature.The blue wire is connected via a 2A fuse to a 12 volt supply that is controlled by the ignition key. Do not connect it directly to the high voltage sections of the ignition circuit. When the PDA is taken from the cradle, the carkit will go in standby mode after a few minutes. Radio Muting The Hands Free PDA Carkit offers a feature which can mute the car radio automatically during a phone call, when playing audio or when a vo