inputs.text: fm transmitter model worth extra - short spend extra bucks get type fm transmitterthe reviews bit conflicting seehems two different devices offered one containing fm transmitter one without fm transmitter also several colors offered assume not affect functionality bought two black ones without fm transmitter one white one fm transmitter seehems like circuitry inside slightly expensive one containing transmitter supports full functionality phone charging audio transfer 30pin connector audio control using docks buttons rehemote adds wonderfully powerful fm transmitter powered phones battery dock without fm transmitter supported audio playback 30pin volume control using buttons dock neither one supported charging dealbreaker contacted seller see received two defective units whether known issuecouple points comparisonthe two adapters width one fm transmitter quarter inch taller hair thickerfor record using iphone 5c running ios 703 tried several different docks cables consistent results