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

**URL:** https://aio.lv/en/product--vakoss-tc-b439k--10650489
**Data updated:** 2026-01-21 11:01 (EET)
**Category:** FM Transmitters
**Manufacturer:** VAKOSS
**Manufacturer code:** TC-B439K
**EAN:** 4718308125641
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 11.49 €
**Prices and availability valid until:** 2026-07-14 23:59
**Price without VAT (21%):** 9.50 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--vakoss-tc-b439k--10650489

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | Thursday | free |
| Pickup points | 25.06.2026 | 1.99 EUR |
| Courier delivery to door | 25.06.2026 | 4.99 EUR |

## Summary 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.

## Long 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

### Storage

| Feature | Value |
|---|---|
| Compatible memory cards | MicroSD (TransFlash) |
| Card reader integrated | Yes |
| Maximum memory card size | 32 GB |
| Maximum USB flash drive size | 32 GB |

### Power

| Feature | Value |
|---|---|
| Output voltage | 5 |
| Output current | 3.1 A |
| Power source type | DC |
| DC input voltage | 12 -24 |

### Ports & interfaces

| Feature | Value |
|---|---|
| Bluetooth | Yes |
| USB 2.0 ports quantity | 1 |
| Device interface | Bluetooth/USB |
| Bluetooth functions | Handsfree calling |

### Display

| Feature | Value |
|---|---|
| Display | LED |
| Built-in display | Yes |

### Radio

| Feature | Value |
|---|---|
| FM band range | 87.5 - 108 |

### Technical details

| Feature | Value |
|---|---|
| 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

| Feature | Value |
|---|---|
| Weight | 0.03 kg |
| Height | 48 mm |
| Width | 83 mm |
| Depth | 49 mm |

## FAQ

### How much does the VAKOSS TC-B439K FM transmitter Bluetooth USB cost, and is it available for purchase?

The price is 11.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 32 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on Thursday at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. 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. More information about warranty service: https://aio.lv/en/warranty

### 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.

## Image

https://aio.lv/img/cache/product/10650489/65639991_large.webp