Upgrade your in-car audio and charging setup with the Yesido Y44 Bluetooth FM transmitter. Connecting to your car stereo via FM frequency, it streams music and hands-free calls wirelessly from your phone at up to 3.1A combined output through dual USB ports simultaneously. Bluetooth 5.0 ensures a stable, clear audio connection for music and calls without interruption. The colorful atmosphere lamp ring adds an ambient glow to your dashboard during night drives. Support for U-Disk and TF card playback means you can play music from external storage devices as well. The built-in voltage detection feature monitors your car battery status in real time. A versatile, all-in-one car companion for music lovers and daily commuters.