Nowadays, audio input (AUX) is eliminated from European car audio equipment, so it is difficult to input audio from terrestrial digitalizer. FM modulator is a device that connects audio signals directly to the FM radio antenna line and allows you to hear from FM radio with high sound quality. Unlike the aerial FM transmitter, it features a high sound quality that minimizes the effects of other FM broadcast and noise by connecting it to the antenna wire. European cars use FAKRA connectors for the antenna wire, but in Japan, they are difficult and very expensive, so they are attached as a standard accessory. It also comes with an audio cable to input the audio signal, so there is no need to prepare it separately. Compared to similar equipment, it is overwhelmingly small (2.7 x 1.2 x 0.5 inches (68 x 30 x 13 mm) so you can place it inside your dashboard. Compatible Vehicles: Imported Cars (European Cars), BMW, Mercedes-Benz, Ferrari, Bentley, AUDI, etc.