Full automatic after you connect it to the power cable.Easily operated, AM/FM radio received.This kit comes with power cable wiring, antenna cable connector, support mounting hardware, main antenna assembly (the motor and mast), easy to replace.Type: Car Radio Antenna KitMaterial: Stainless SteelSection: 5Capacity: 803pfVoltage: DC 12VElectrical Current: 0.8AmpCable Length: 1200mm/47.24" (Approx.)Extend: 750mm/29.53" (Approx.)Under Fender: 325mm/12.80" (Approx.)Fender Mounting Diameter: 15mm/0.59" (Approx.)Notes:Due to the light and screen setting difference, the item&39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Car Radio Antenna Kit