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

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

VAKOSS TC-B439K FM transmitter Bluetooth USB Photo 1
VAKOSS TC-B439K FM transmitter Bluetooth USB Photo 2
VAKOSS TC-B439K FM transmitter Bluetooth USB Photo 3
VAKOSS TC-B439K FM transmitter Bluetooth USB Photo 1
VAKOSS TC-B439K FM transmitter Bluetooth USB Photo 2
VAKOSS TC-B439K FM transmitter Bluetooth USB Photo 3
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Short description

VAKOSS TC-B439K is an FM transmitter for cars with Bluetooth and USB interfaces, transmitting across 87.5–108 MHz. Supports MP3/WAV playback from USB flash drives or microSD (up to 32 GB), has hands-free calling via Bluetooth, LED display with RGB backlight, volume buttons and two USB ports (5 V, 3.1 A output). Powered from 12–24 V DC, compact and lightweight for in‑car audio streaming and charging.
Warranty: 2 Years
SKU: 10650489
Manufacturer: VAKOSS
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Product information

Description

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.

Usage 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.

Specifications

Device interface:
Bluetooth/USB
FM band range:
87.5 - 108
Weight:
0.03 kg
Compatible memory cards:
MicroSD (TransFlash)
Product colour:
Black
All features

Storage

Compatible memory cards:
MicroSD (TransFlash)
Card reader integrated:
Yes
Maximum memory card size:
32 GB
Maximum USB flash drive size:
32 GB

Power

Output voltage:
5
Output current:
3.1 A
Power source type:
DC
DC input voltage:
12 -24

Ports & interfaces

Bluetooth:
Yes
USB 2.0 ports quantity:
1
Device interface:
Bluetooth/USB
Bluetooth functions:
Handsfree calling

Display

Display:
LED
Built-in display:
Yes

Radio

FM band range:
87.5 - 108

Technical details

Product colour:
Black
Audio formats supported:
WAV
MP3 playback:
Yes
Volume control:
Buttons
USB direct playback:
Yes
Case colour:
Black
Hands-free calling:
Yes

Weight & dimensions

Weight:
0.03 kg
Height:
48 mm
Width:
83 mm
Depth:
49 mm

Description

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Customer reviews

Customer questions

FAQ

What payment options are available?

AiO.lv offers several payment methods: Bank transfer. All transactions are 100% secure and encrypted.

Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

What is the warranty period?

All VAKOSS products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized VAKOSS service centers and through AiO.lv

Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. We will assist with consultation, warranty claim processing, and coordination with certified service centers.

How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: device interface, fm band range, weight, compatible memory cards, product colour, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.
warranty
14-Day Return Policy We are confident in our quality, but if the purchase doesn’t fit — you have 14 days to return the product with peace of mind.
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Fast Delivery Get your orders as quickly as possible — right to your door, parcel lockers, or pickup points across Latvia and the EU.
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Secure Payment Pay the way you prefer: cash, VISA, MasterCard, Apple Pay, Google Pay, bank transfer, or 0% installment plan.
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Quality Since 2008 AiO.lv has been on the market for over 18 years and has earned trust — with more than 6000 genuine positive reviews on Google.