Dual USB charging port: Two 2.1A USB charging ports for external expansion of portable devices, suitable for charging all mobile phones, tablets and other electronic products. ABS material: The FM transmitter is made of high-quality ABS material, which has higher wear resistance, corrosion resistance, durability and a longer service life. The FM transmitter is professionally designed and requires no additional settings. Installation is simple, but professional installation is strongly recommended to avoid problems or damage. Multifunctional: The Bluetooth FM transmitter supports CD playback and TF/U card reading function and supports music in MP3/WMA format. Supports Bluetooth calls, Bluetooth music streaming, caller ID, 1.3-inch LED dot matrix display, power-on voltage, frequency display, file name and working status information. Applicability: Two USB2.1A charging ports for external portable devices, suitable for charging all mobile phones, tablets and other electronic products. Input and output: AUX input and output function and one-touch switch with pause, answer/listen/up and down functions. Supports memory shut-off and folder playback. Dual USB charging port: Two 2.1A USB ports provide fast charging for mobile phones, tablets and more, ideal for on the go. High-quality ABS material: Robust ABS guarantees high wear resistance and durability of the FM transmitter for a long service life. Versatile features: Supports CD playback, TF/U cards, Bluetooth calls and music with LED display for showing frequencies and call information. Easy to use: One-touch switch for pause, calls and track selection, supports AUX input/output as well as memory lock and folder playback. Wide compatibility: Compatible with MP3/WMA music formats, ideal for Bluetooth music streaming and calls, suitable for numerous devices and applications.