Bluetooth 5.3 Technology and Zinc Alloy Frame- Our Bluetooth headset adopts the latest Bluetooth 5.3 technology and a sturdy zinc alloy frame, which greatly improves the transmission speed and connection stability, ensuring clear and lossless sound quality. Three USB Ports for Intelligent Fast Charging- Equipped with three USB ports (PD 36W, QC 3.0 18W, USB A 12W), it can quickly charge three devices at the same time, and has built-in over-current, over-voltage, temperature control and short-circuit protection functions. HD Hands-Free Calls- Our FM transmitter uses advanced Bluetooth and CVC noise reduction technology to provide clear and interference-free calls. Supports hands-free operation to enhance driving safety and convenience. Automatic Rainbow Ambient Light- The stylish rainbow ambient light turns on automatically to create a pleasant driving atmosphere. Double-click the round button to easily turn it off, allowing you to control the atmosphere in the car according to your preferences. Multiple Playback Modes and Voltage Display- Supports Bluetooth connection and USB (up to 64GB) playback, supports multiple audio formats such as MP3, WMA, WAV, FLAC, etc. It has a power-off memory function and displays the vehicle voltage to adapt to different types of vehicles and user needs.