Bluetooth FM Transmitter & MP3 Player for Car Built-in MIC, Hands-Free Calling, Dual USB Charger (5V/3.1A & 1A), SD/USB Support

The Bluetooth FM transmitter + MP3 player is a compact, plug‑in car accessory that upgrades an older or basic car stereo system by adding modern wireless and digital audio connectivity. Once plugged into your car’s cigarette‑lighter power socket (12 V/24 V), it pairs via Bluetooth with your smartphone or other Bluetooth‑enabled device — enabling you to stream music, radio, or navigation/audio prompts directly to your car’s speakers over FM radio. Many models also let you plug in a USB drive or SD (TF) card with MP3/WMA/WAV (or other supported audio formats) so you can play offline music without needing your phone.

With a built‑in microphone and hands-free mode, the device supports safe, convenient calling while driving — you can answer or reject calls with a button, and your car speakers act as the call audio output. At the same time, dual USB charger ports (with outputs like 5 V/3.1 A + 5 V/1 A) let you charge one or two devices while using music features — ideal for long drives or for charging your phone or tablet. The setup typically also includes FM frequency tuning (e.g. 87.5–108.0 MHz), automatic phone reconnection, and simple “plug‑and‑play” installation, making it a versatile solution for upgrading your car’s audio without replacing the entire stereo system.