Key benefits Add wireless audio and hands calling to any car with an FM radio. Bluetooth 5.0 provides a more stable connection and faster pairing than older adapters. Dual USB ports with a smart charging chip let you charge two devices safely while driving and manage power delivery to prevent overcurrent or shortcircuit conditions. Builtin MP3 playback from TF (microSD) card or USB storage lets you play music without using phone data or Bluetooth, reducing interruptions and preserving phone battery. Compact, plugandplay design converts your vehicle's cigarettelighter socket into a multifunctional media and charging hub. What this product does for you Keeps you safer on the road by enabling hands calls through the car audio system so you can keep both hands on the wheel. Lets you stream phone audio to older cars that don't have Bluetooth by broadcasting via a selectable FM frequency. Serves as a reliable charger and media player in one device so you can listen, talk, and charge simultaneously. Key features and attributes Bluetooth 5.0: stable wireless connection, quicker pairing, and improved range compared with previous Bluetooth versions. Hands calling: builtin microphone for clear voice calls routed through the car speakers. MP3 player: supports playback from a TF (microSD) card; also compatible with USB storage devices for MP3 files. Dual USB smart ports: charge two phones or devices at the same time; onboard smart chip regulates charging current for safer charging. Voltage adapter functionality: converts vehicle power to the appropriate USB charging voltage, providing reliable power to connected devices. Simple controls: basic buttons and interface for frequency selection, play/pause, and call management (answers, hang up). Broad compatibility: works with smartphones, tablets, MP3 files on TF cards and USB drives, and most FM car radios. Typical use cases Daily commute: Pair your phone via Bluetooth to make and receive calls hands and stream navigation voice prompts and music through the car speakers. Road trips: Load a TF card or USB drive with MP3 playlists, plug the transmitter into the car socket, tune the car radio to the selected frequency, and enjoy uninterrupted music while charging two devices at once. Older vehicles: Add Bluetooth streaming and modern USB charging to a vehicle that only has an FM radio and a cigarettelighter socket. Easy setup 1. Plug the transmitter into your car's 12V socket. 2. Turn on your car radio and set it to an unused FM frequency. 3. Pair your phone with the transmitter using Bluetooth 5.0. 4. Select the same FM frequency on the transmitter; start playback from your phone, TF card, or USB drive. What to expect Reliable wireless streaming for calls and music in most driving environments. Twodevice charging managed by a smart chip for safer, optimized charging. MP3 playback from removable media for offline listening. Package compatibility Designed for vehicles with a standard 12V cigarettelighter socket and an FM radio receiver. Compatible with smartphones and tablets that support Bluetooth audio and with TF (microSD) cards and USB drives containing MP3 files. Note: For audio quality, choose a clear FM frequency on your local band and ensure the transmitter and car radio are set to the exact same frequency.