2 Secure Charging Usb Ports: Supports charging 2 devices simultaneously with overcharge protection. One USB port (5V/1A) with music icon can play USB disk, another USB charging port (5V/2.4A) charge your smart device efficiently. Enjoy stereo streaming in the car and charge smartphones at the same time. 3 Music Playback Modes: This car Bluetooth adapter can freely stream clear stereo music in 3 ways: a.Bluetooth connection; B. USB Flash Disk (32GB); C. TF card (32GB), supports MP3/WMA/FLAC/WAV/APE format. Hands-free calls: Built-in microphone with echo cancellation and noise suppression (CVC) technology, this car Bluetooth transmitter provides amazing hands-free function; Answer/reject/hang up/redial calls all in one multi-function button; Automatically switch to hands-free mode from music playing status when apps