Product Features Dual USB Charging Ports and Type-C Fast Charger: This car FM transmitter with two USB ports for charging devices, it has two USB charging ports, can charge two devices at the same time and has overcharge protection. Smart Type-C USB charges compatible devices up to 4x speed of the conventional charging Hi-Fi Music and 3 Playing Modes: This upgraded BT car adapter supports playing music via BT, USB disk, TF card. It can bring you an amazing auditory experience with its clear and stereo sound. Hands-Free Calling: Built-in microphone, this BT FM transmitter enables you to answer, hang up, reject a call, or redial the last number with ease. You can use the multi-function button to control calls and music. Note 1 Please change another stable channel if it has a lot of static because of frequency conflict. 2 Please keep the frequency of the FM transmitter and your car radio be the same. Product Specification Type BT FM Transmitter Material ABS Size 50x37.8x87mm Working Voltage 12V ~ 24V Music Format MP3 / WMA USB1+2 Output 5V / 3.1A USB3 Output Type-C Fast Charger Support U Disk Capacity 1G-32G BT Effective Distance 5-10M FM Transmission Frequency 87.5MHz-108.0MHz Connection Method BT/U disk/TF card Package Included 1x BT 5.0 FM Transmitter 1x User Manual