JUST WIRELESS 20087 Wireless Hands-Free Bluetooth FM Transmitter allows you to enjoy wireless music streaming and hands-free calling in your car. With Bluetooth 5.0 technology, it provides a stable and strong connection for seamless music playback and crystal-clear calls. It features dual USB ports, one with Quick Charge 3.0 for fast charging of compatible devices, and the other for playing music from USB flash drives. Additionally, it supports TF card playback, allowing you to expand your music options. The car battery monitor function helps you keep an eye on your vehicle's battery status.