FM transmitter VAKOSS TC-B457 Bluetooth car audio transmitter, hands-free, USB power

VAKOSS TC-B457 is an FM transmitter with Bluetooth designed to enable wireless audio streaming and hands-free calling through a vehicle's FM radio. The unit pairs with smartphones or other Bluetooth-enabled devices to send music, podcasts and navigation prompts to the car stereo. Powered by a USB connection, it provides playback and call controls so users can manage media and conversations without interacting directly with the phone.

Advantages

The transmitter supports Bluetooth audio streaming and hands-free voice calls, allowing media and phone audio to play through the car’s FM radio. USB power supply eliminates the need for internal batteries and ensures continuous operation while driving. Integrated controls simplify track selection, call answering and call hanging up, reducing distraction. The compact design and FM broadcast method make it compatible with a wide range of vehicles without requiring additional audio inputs.

Suitable for

• Vehicles without auxiliary or Bluetooth-enabled factory stereo systems
• Drivers who need hands-free calling and simple playback control while on the road
• Users who want to stream music or navigation audio from a smartphone to a car radio
• Situations where a USB-powered, plug-and-play audio solution is preferred

Key specifications

• Transmission method: FM radio broadcast from the device to the vehicle stereo
• Wireless connectivity: Bluetooth audio streaming and hands-free profile
• Power supply: USB-powered operation
• Controls: Basic playback and call control buttons on the unit
• Form factor: Compact plug-and-play design for in-car placement

How to use

Plug the VAKOSS TC-B457 into a USB power source in the vehicle, pair a smartphone with the transmitter via Bluetooth, then set the car radio to an unused FM frequency and tune the transmitter to the same frequency. Start audio playback or accept a call from the paired phone; audio will be transmitted to the car stereo. Use the built-in controls to play, pause, skip tracks or answer and end calls. Adjust the car radio volume and the phone’s playback volume to achieve the desired listening level and clarity.

Usage recommendations

Choose an FM frequency with minimal local radio interference for clearer audio transmission. Keep the smartphone within the Bluetooth range of the transmitter and ensure the USB power source provides stable output. For best call quality, park in an area with good cellular reception and reduce background noise inside the vehicle.