Radio adapter, charger with PD3.0 (USB-A) connection, hands-free function, wireless car player, transmitter, MP3, TF card (micro SD), USB, pendrive, flash memory, LED backlight, Siri and Google Assistant support Special Feature: Car charger, short-circuit protection Connector type: Bluetooth, USB Input device interface: USB, Bluetooth Wireless communication standard: Bluetooth Supports Bluetooth technology: Yes Connector type: USB 2.Dual Smart USB Ports & Safe ChargingEquipped with 2 USB ports, you can charge two devices at the same time. Built-in overload protection, over-voltage protection, intelligent temperature control and short-circuit protection for efficient charging. 3.Hands-free calling and voice navigationBluetooth ensures a stable connection between your phone and the Bluetooth adapter of the car stereo, while CVC noise reduction and echo cancellation technology provides an amazing calling experience. 4.Car battery voltage detection and Blue Ambient LightThe FM transmitter displays the car's voltage when connected to the car's cigarette lighter. It can monitor the status of the car battery at any time to avoid driving errors. The blue light of the product allows you to drive safely. 5.More Compatibility Fits most Bluetooth-enabled devices (such as iPhone, iPad, iPod, Tablet, Samsung, HTC, Sony and other Android smartphones) and all types of vehicles including cars, vans and trucks (12-24 V). When turned on, the device will automatically connect to the paired device. Widest range from 87.5MHz to 108MHz for a more stable and consistent music experience without interference.