Bluetooth 4.0 FM Transmitter for Car: Enjoy wireless music streaming and hands-free calls in your car. Bluetooth 4.0: Supports Bluetooth calls, Bluetooth music streaming, and call answering. Versatile Playback: Compatible with USB drives and TF card slots, supporting MP3/WMA format music. FM Transmission: Broadcasts on frequencies from 87.5-108.0MHz. Clear Display: Features a 1.3" LED dot matrix display showing frequency, file name, and working status. Dual USB Charging: Equipped with 2.1A dual USB charging ports for charging mobile phones, tablets, and other electronic devices. Memory Function: Supports memory at power failure and folder playback. Customizable Settings: Offers one-button menu language setting, playback mode, and audio mode. Auxiliary Input/Output: Includes Aux input and output functions. Easy Controls: Features a one-button switch for play/pause, answer/hang up calls. Specifications: Bluetooth version 4.0+EDR, effective distance 0.5-2m, transmission distance 10m, supports up to 128GB memory, and operates in temperatures from 0-40°C. Package Includes: 1 x FM Transmitter, 1 x User Manual, 1 x Audio Cable