2 USB Ports: 5V/3.1A- Bluetooth FM transmitter equipped with 2 USB ports (5V/3.1A), you can charge two devices simultaneously and has overcharge protection. The USB port with music icon not only for charging, but also for reading U disk/Micro SD card (32GB) to play your favorite music. A multiple of music formats are all supported. Hands Free Excellent Stable Bluetooth V5.0- Built-in mic frees your hand to call. You can answer, hang up, reject a call or redial the last number easily. With built-in latest Bluetooth V5.0 chip, this car bluetooth fm transmitter has stronger Bluetooth signal and faster data transmission speed, which will make your connection faster and more stable. 3 Play Modes- This upgraded bluetooth car adapter can play music via Bluetooth, TF card and USB disk. It can bring you amazing hearing experience with clear sound and stereo sound. Car Bluetooth FM transmitter is suitable for all devices with Bluetooth. Easy to Use- Plug the car bluetooth transmitter into the car cigarette lighter, tune your car radio to an unused FM frequency (range 87.5-108MHz), then pair this FM transmitter car at the same frequency. Pair these hands-free car kits with your phone/tablet via Bluetooth. After successfully pairing, it will transmit music from your phone to the car stereo system. Wide Compatibility- With advanced Bluetooth V5.0 chip, the wireless Bluetooth radio adapter can achieve fast connection, more stable signal reception, anti-interference performance, lower power consumption and more.And widely compatible with Phone, Pad, Huawei, Samsung, tablets, Android smartphones and any other Bluetooth devices as well as all 12-24V vehicles.