FM transmitter VAKOSS TC-B439K Bluetooth USB, 87.5–108 MHz, microSD/USB playback, 5V/3.1A output, RGB display

VAKOSS TC-B439K is an FM transmitter that broadcasts in the 87.5–108 MHz band and provides Bluetooth connectivity, USB and MicroSD media playback, and a clear LED display. The unit is designed for use with 12–24 V DC power sources and delivers a 5 V output for connected devices. Compact and lightweight, the transmitter supports MicroSD cards and USB flash drives up to 32 GB.

Advantages

The Vakoss TC-B439K combines Bluetooth handsfree calling, USB and MicroSD playback, and an easy-to-read LED display in a compact housing. It covers the full FM broadcast range (87.5–108 MHz) and accepts 12–24 V input, making it compatible with most vehicle power systems. The device is lightweight and simple to operate.

Suitable for

• Streaming music from a phone via Bluetooth
• Playing audio files from USB flash drives (up to 32 GB)
• Playing audio from MicroSD cards (up to 32 GB)
• Handsfree phone calls in vehicles using Bluetooth

Key specifications

• Brand: VAKOSS
• Model: TC-B439K
• FM band range: 87.5 - 108 MHz
• Device interface: Bluetooth / USB
• Compatible memory cards: MicroSD (TransFlash), up to 32 GB
• USB support: USB flash drive, up to 32 GB
• Power input: 12 - 24 V DC
• Output: 5 V
• Weight: 0.03 kg
• Colour: Black
• EAN: 4718308125641

How to use

Connect the Vakoss TC-B439K to a 12–24 V DC socket in your vehicle. Select an unused FM frequency on the transmitter within the 87.5–108 MHz range and tune your car radio to the same frequency. Pair your phone with the transmitter via Bluetooth for audio streaming and handsfree calls, or insert a MicroSD card or USB flash drive containing audio files. The LED display shows the selected frequency and playback status.

Recommendations

For best reception, choose an FM frequency with minimal local interference. Use MicroSD cards and USB drives formatted in standard FAT/FAT32 and do not exceed 32 GB. Ensure the vehicle power socket provides the specified 12–24 V DC input.