Bass Boosted Hi-Fi Stereo car Bluetooth FM transmitter. Simply click "B" to activate the BASS sound effect with one click. It features high-quality Hi-Fi technology to deliver clear sound with deep bass, enhancing your listening experience. Dual Microphone Hands-Free Calling This car Bluetooth adapter has an upgraded dual-microphone design with CVC noise reduction and echo cancellation technology. Easily manage calls with connect, hang up, and reject functions for a clearer hands-free calling experience. 48W Fast Charging This Bluetooth car charger includes a 30W PD 3.0 fast charging port and an 18W QC 3.0 port, allowing simultaneous fast charging for two devices. Supports fast charging for Samsung, iPhone, Xiaomi, Google, and other compatible devices. Bluetooth 5.3 and USB Playback Equipped with an upgraded Bluetooth 5.3 chip for faster, more stable, and reliable wireless transmission, minimizing delay and connection issues. Offers two audio playback options: Bluetooth streaming and USB drive support. LED Light Bar and Display Features a 7-color LED light bar for easy visibility at night (can be turned off). Includes LED indicators that display device status and automatically detect vehicle battery voltage. Safety Protection and Wide Compatibility Built-in protections against overcurrent, surges, overheating, and short circuits ensure safe charging. Operates on 12V24V vehicles. Frequency range: 87.5 MHz to 108 MHz. Automatically reconnects to previously paired Bluetooth devices. Compatible with 99% of smartphones.