[Upgraded Bluetooth Technology] - Upgraded Bluetooth technology ensures you enjoy faster pairing, stable connections, and smarter audio streaming while driving. Moreover, the Bluetooth car connector features auto-reconnection, eliminating the need for repeated pairing after the initial successful connection, making it convenient and practical. [Dual USB Ports & Safe Charging] - The Bluetooth car adapter is equipped with 2 USB charging ports (5V-3.1A & 5V-1A), allowing simultaneous charging of 2 devices. Moreover, the Bluetooth car transmitter supports multiple protection functions including over-voltage, short-circuit, over-current, and over-temperature, ensuring a safer driving journey for you. [Wireless Hands-Free Calling] - Stay safe and focused on the road with wireless hands-free calling capabilities. Effortlessly answer calls at the touch of a button with our Bluetooth car transmitter and chat clearly using the built-in microphone for crystal-clear sound quality. [3 Music Play Modes] -The car music adapter supports 3 play modes. You can stream music from Bluetooth devices to your car stereo via FM signals or play music by inserting a USB flash drive (≤32GB)/Micro SD card (≤32GB). The car music adapter supports various music formats such as MP3, etc., ensuring compatibility with your favorite audio files. [User-Friendly Design] -When the Bluetooth car radio adapter is plugged into the cigarette lighter, it displays the car's voltage, allowing you to monitor the car's health status at any time. Equipped with blue LED backlight, it helps you clearly see the buttons even in the dark, ensuring safe driving at night. Compatible with a wide range of Bluetooth-enabled devices, as well as vehicles running on a 12-24V power supply.