【Bluetooth-compatible Hands-Free Calling】Enjoy convenient hands-free communication while driving, ensuring safety and compliance with traffic laws. 【3.1A USB Charging Port】Equipped with a USB port that supports fast charging up to 3.1A for your devices on the go. 【Advanced Audio Processing】Features echo cancellation and noise reduction technology for crystal-clear call quality. 【Versatile Connectivity】Supports multiple audio sources including USB, TF card, and Bluetooth-compatible connections for maximum flexibility. 【FM Transmitter】Incorporates stereo Bluetooth-compatible and FM transmission technology, allowing you to play your music through your car's speakers. 【Auto Memory Function】Automatically remembers your settings and playback position when powered off for a seamless experience. Specifications: Bluetooth-compatible Version: 5.3 FM Transmission Frequency: 87.5-108MHz Power Source: 12V-24V DC (cigarette lighter socket) USB Charging Output: 3.1A Supported Audio Format: MP3 Compatible Devices: USB flash drives, TF cards, Bluetooth-compatible devices