Adopting anti-static design and equipped with CVC technology to suppress noise and wind, it can achieve full duplex sound quality. You can play music on the car audio system through Bluetooth/USB flash drive ( 32GB)/microSD card ( 32GB). Supports WMA, MP3, WAV, APE, and FLAC music formats.Smart dual USB ports and secure charging - with 2 USB ports (5V-2.4A and 5V-1A), you can charge both devices simultaneously. Built in overcurrent protection, overvoltage protection, intelligent temperature control, and short circuit protection, effectively ensuring safe charging.Handsfree calling and voice navigation - Bluetooth provides a stable connection, while noise suppression (CVC) technology and echo cancellation provide an amazing hands-free calling experience. In addition, you can also get clear voice navigation from the app on your phone, which means driving will be safer.The car battery voltage detection and blue ambient light - FM transmitter will display the car's voltage level when the cigarette lighter is inserted. Stay informed about the health status of car batteries at all times to avoid problems while driving. This car charger has a blue backlight around it, which greatly simplifies your operation and makes driving safer. (Please compare the dimensions between the transmitter and your car cigarette lighter)Wider Range and Compatibility - This Bluetooth transmitter is compatible with most smartphones and more devices equipped with Bluetooth functionality. When turned on, it will automatically connect to the paired Bluetooth device it remembers. In addition, in the wider range of 88.1MHz-107.9 MHz, you can get a more stable and relevant music experience without interference