Perfectly compatible with most of smart phones/tablets. Perfect audio transmission function. Full frequency range design effectively avoids interruption. Through the car speaker， the item can provide a function about hands-free conversation. (Need to connect with 3.5mm audio). The item can also charge your phone via the car charger. Do you enjoy listening to music through FM radio in your car? This product can help you. It can play your favorite iPhone， iPod or other smartphones through almost any FM radio. Very easy to use and carry. It will transfer your favorite music from your iPhone， iPod or other smartphones to a nearby FM radio quickly and easily. Just need to plug the FM transmitter into the 3.5mm Audio socket of your MP3， iPod， iPhone， Mobile phone or other music player， and turn your FM radio to a clear frequency and play your digital music wirelessly with rich， full sound. Specifications: Band: FM Frequency Quality: Hi-Fi stereo Range: 88.1 - 107.9 MHz Interval: 0.1 MHz Stability: 10ppm Clutter & Harmonic: <= -60dB Effective Range: About 5m Stereo separation: 40db Frequency Reponse: 20Hz - 16Khz Audio Distortion: <= 0.1% SNR: >= 45DB Length: 120cm Package included: 1 x Black FM Transmitter 3.5mm Audio 1 x Car charger