Upgraded Bluetooth 5.3 technology ensures that you enjoy faster pairing, more stable connections, and smarter audio transmission while driving. Moreover, the Bluetooth connector for car features automatic reconnection, eliminating the need for repeated pairing after the initial successful connection, thus making it convenient and practical. Dual USB Ports & Safe Charging: The car radio bluetooth transmitter with 2 USB ports (5 V to 2.4 A and 5 V to 1 A), you can charge two devices at the same time. With the integrated functions such as overcurrent protection, surge protection, intelligent temperature control, short circuit protection, it can guarantee safe charging effectively Hands-free Calling and Voice Navigation - Bluetooth provides a stable connection, while CVC noise cancellation and echo cancellation technology grants an incredible hands-free calling experience. In addition, you can also achieve clear voice navigation from your phone's app, which means driving will be safer. Car Battery Voltage Detection and Blue Ambient Light - The FM transmitter will show the car voltage when plugged into the cigarette lighter. Master the health of the car battery at any time to avoid faults while driving. It will greatly simplify your operation with the blue backlight circle around the lighter for safe driving. Wider Range and Compatibility - The Bluetooth transmitter is compatible with most smartphones and other devices that are equipped with Bluetooth function. It will automatically connect to the paired device stored when it is turned on. Also, with the widest range from 87.5 MHz to 108 MHz, you can achieve a more stable and consistent music experience without interference.