Wireless New Generation FM Transmitter desinged for Nokia Lumia 928 with Powerful Compact Car Charger Included Full FM frequency spectrum is available and is user selectable in 0.1MHz increments from 88.1 to 107.9 MHz. Advanced Digital PLL sound coding maintains stable and high quality sound. Specification: Input Voltage (12-24 vDC), Cable length (50 inches), Transmitter Dimensions (2.25 X 1.25 X .25 inches), Circuit Design (Nokia Lumia 928 Specific) Car charger includes smart technology circuit architecture to provide precision voltage and resistor regulation specific to the Nokia Lumia 928. Protects the internal battery longevity by modulating the charge in a safe and efficient manner. Generous LED screen clearly displays current frequency setting. Transmitter frequency continues to be locked in even when vehicle power is cut. Product is designed to last and is backed by our Gomadic Lifetime Warranty. Buy with confidence!