Ambient light switch design: Press the red 'B' button twice to directly turn the coloured lights on or off. Upgraded Bluetooth 5.3 technology: The latest Bluetooth 5.3 optimises transmission delay and connection problems. Bluetooth 5.3 will give you a faster, more stable and smarter connection with less sound quality loss, uninterrupted calls and music experiences. It only takes 1 second to complete the connection, and no reconnection is required after the first successful pairing with your device. Intelligent dual USB ports and fast charging: With two USB ports (PD 36W and USB-A 12W), two devices can be charged at the same time. Built-in over-current protection, over-voltage protection, intelligent temperature control, short circuit protection, it will effectively ensure safe charging. Great clear music streaming: Bluetooth 5.3 provides a stable connection, while noise reduction (CVC) technology and echo cancellation allow an amazing hands-free calling experience. In addition, this Bluetooth car adapter supports Bluetooth and USB stick connections up to 64 GB. Use scenarios: - Daily commute: enjoy music and hands-free calls with charging for your phone. - Long road trips: power two devices at once while streaming audio and navigation prompts. - Shared or rental cars: connect via Bluetooth or play media from a USB stick up to 64 GB.