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. * Transmitters emit a powerful FM signal that is the maximum allowed by FCC regulation. Advanced signal isolation provides crystal clear sound quality. * Smart technology circuit architecture provides precision voltage and resistor regulation specific to the BeBook Mini. Protects the internal battery longevity by modulating the charge in a safe and efficient manner. * Non-coiled cable design allows for easy routing around your vehicle trim for a more professional look. Durable construction is built to last. * Specification: Input Voltage (12-24 vDC), Cable length (50 inches), Dimensions (4.0 X 1.75 inches), Circuit Design (BeBook Mini Specific)