Excelvan F27 FM Transmitter for Samsung Galaxy S III/IV/3/4, Samsung Galaxy Note II/2 , HTC One, Blackberry, SONY smart phone, MP3, MP4 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. Full frequency range design effectively avoids interruption. Compatible with virtually any Smart Phone and MP3/ MP4. Perfect audio transmission function. Trip companion.