Upgraded Bluetooth FM Transmitter for Car: Advanced Bluetooth V5.0 chip provides faster pairing and stable connection. Two times higher transmission efficiency than V4.2. Also, you can use Siri or Google Assistant to make phone calls, send texts or get driving directions. | Upgraded Faster USB Charging Solution: This FM transmitter features both 18W PD and QC 3.0, totally output 36W/6A with two independent quick charge chips, while most similar products on Amazon only output 18W/3A with one shared quick charge chip. This one can charge two devices simultaneously at full speed, while others only output 2.4A per USB port when charge two devices simultaneously. | Enjoy Hands-free Calls: This FM Bluetooth adapter for car has a High-performance microphone with Noise Suppression (CVC) design, granting you loud, and crystal clear for hands-free call. Answer/redial/dismiss or end the call all in One button and Seamlessly switch between incoming calls and music, which makes it much safer and more convenient when driving. | 1-Key Bass Booster: This Bluetooth FM Transmitter features a 1-key enhance Bass Button, enables you to immerse in Hi-Fi music conveniently. Enjoy the crystal stereo sound music in the car travel! | Safe Usage with All-Round Protections: All SUPERONE products come with 18-Month money back or new replacements. This car Bluetooth adapter with built-in over-current protection, over-voltage protection, intelligent temperature control, and short circuit protection, which will strengthen safety and avoid possible danger.