about this article Stream crystal clear music - T25 is developed according to the principle of anti-static, equipped with CVC noise reduction and wind reduction technology to achieve full-duplex sound quality. You can stream music to your car radio via Bluetooth / Flash USB (32GB) / Micro SD Card (32GB). Music format: WMA/MP3/WAV/APE/FLAC. Smart Dual USB Ports & Safe Charging: Equipped with 2 USB ports (5V to 2.4A and 5V to 1A), you can charge two devices at the same time. Built-in over-current protection, over-voltage protection, intelligent temperature control, short-circuit protection and other functions to effectively ensure charging safety. Hands-free calling and voice navigation Bluetooth provides a stable connection, while noise cancellation (CVC technology) provides incredible hands-free calling. In addition, you can also get clear voice navigation through the mobile APP, making driving safer. Mood Light - Displays the car's voltage when the FM transmitter is connected to the cigarette lighter. Always know the condition of your car battery to avoid problems while driving. The blue backlit circle around this car charger makes it easier to use and safer on the go. Wide Applicability: This bluetooth transmitter is compatible with most smartphones and other bluetooth devices. Automatically connect to saved Bluetooth devices after booting. Plus, with a wider frequency range from 87.5 MHz to 108 MHz, you get a more stable and consistent music experience free from interference.