Excelvan F11B FM Transmitter 3.5mm Audio-in Car Charger Holder with Remote Control for Samsung Galaxy S III/IV/3/4 Provides hands-free conversations through your car speakers. (need to connect with 3.5mm audio) USB output charging for Mobile Phones, GPS, and other devices. Compatible with virtually any Smart Phone and MP3/ MP4. Full frequency range design effectively avoids interruption. Perfect audio transmission function.