# Headset DEFENDER FreeMotion B400 — wired & wireless, USB-C, AUX, closed supraaural headphones, 20–20000 Hz, 118 dB, LED backlight, black

**URL:** https://aio.lv/en/product--defender-63400--10900982
**Data updated:** 2026-01-22 15:57 (EET)
**Category:** Headphones
**Manufacturer:** DEFENDER
**Manufacturer code:** 63400
**EAN:** 4745090824162
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 25.99 €
**Prices and availability valid until:** 2026-07-27 23:59
**Price without VAT (21%):** 21.48 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--defender-63400--10900982

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | Thursday | free |
| Pickup points | 07.07.2026 | 1.89 EUR |
| Courier delivery to door | 07.07.2026 | 4.99 EUR |

## Summary description

DEFENDER FreeMotion B400 is a head-band headset with closed supraaural cups for universal use. It supports wired and wireless connectivity with USB Type‑C and AUX inputs, and includes one USB‑A port. Frequency response is 20–20000 Hz with 118 dB sensitivity. Features LED backlight and lightweight 0.22 kg construction for comfortable everyday wear.

## Long description

The Defender FreeMotion B400 is a compact, foldable wireless Bluetooth headset with wired connectivity via included audio cable and USB Type-C charging. It features LED backlit earcups, a built-in microphone for clear voice transmission, a MicroSD card slot for standalone MP3 playback and a lightweight supra-aural design with an adjustable headband. Battery life reaches up to 32 hours without backlight; actual runtime depends on volume, listening mode and conditions. The headset supports hands-free calls and music playback with a wireless range up to 15 m and weighs 220 g.
Advantages
Foldable construction and light weight make the headphones easy to carry and store. LED backlight on the earcups can be switched off by double-clicking the M/EQ button. Built-in microphone and on-earcup controls allow answering calls and changing tracks without handling your phone. The MicroSD slot converts the headset into an MP3 player for offline listening, and the included audio cable enables wired use when the battery is discharged.
Suitable for
Everyday music listening and internet radio
Hands-free phone calls and voice communication
Travel and commuting thanks to foldable design
Listening without a smartphone using MicroSD cards
Use with laptops or devices via wired connection when needed
Key specifications
Model: Defender FreeMotion B400 (MPN 63400, EAN 4745090824162)
Connectivity: Bluetooth and wired (audio cable included), USB Type-C charging
Frequency range: 20–20,000 Hz
Wireless range: up to 15 m
Battery life: up to 32 hours (without backlight)
Weight: 220 g
Ear coupling: supra-aural; wearing style: head-band
Color: Black
How to use
Power on the headset and pair it with your Bluetooth device following standard pairing procedures. Use the on-earcup controls to play/pause music, skip tracks and answer or end calls. To play music from a MicroSD card, insert a supported MicroSD card into the slot and use the controls to navigate tracks. If the battery is low, connect the provided audio cable between the headset and your device for wired listening or recharge via the USB Type-C port.
Usage recommendations
For optimal battery life, disable LED backlight by double-clicking the M/EQ button when backlight is not needed. Keep the headset within the specified wireless range and avoid prolonged exposure to high volume levels to preserve hearing and device performance.

## Specifications

### Headphones

| Feature | Value |
|---|---|
| Headphone frequency | 20 - 20000 |
| Headphone sensitivity | 118 dB |
| Ear coupling | Supraaural |
| Acoustic system | Closed |
| Intraaural headphones type | Earbuds |
| Noise canceling type | Passive |
| Diaphragm diameter | 40 mm |
| Noise canceling | Yes |

### Ports & interfaces

| Feature | Value |
|---|---|
| Connectivity technology | Wired & Wireless |
| Bluetooth version | 5.3 |
| Wireless range | 15 m |
| Frequency band | 2.402 - 2.48 |
| Bluetooth | Yes |
| Bluetooth profiles | A2DP, AVRCP, HFP, HSP |
| USB connectivity | Yes |
| USB connector | USB Type-C |
| 3.5 mm connector | Yes |

### Performance

| Feature | Value |
|---|---|
| Product colour | Black |
| Volume control | Button |
| Control type | Buttons |
| Detachable cable | Yes |
| Housing material | Plastic |
| Headset type | Binaural |
| Wearing style | Head-band |
| Operating keys | Multi-key |
| Recommended usage | Calls/Music/Sport/Everyday |
| Product type | Headphones |
| Music playback | Yes |
| Adjustable headband | Yes |
| Control unit type | On-ear control unit |

### Technical details

| Feature | Value |
|---|---|
| Pallet ITF-14 (EU) | 14745090824169 |

### Other features

| Feature | Value |
|---|---|
| Equalizer | Yes |
| Talk time | 32 h |
| Continuous audio playback time | 32 h |
| Backlight colour | Multicolour |
| Backlight | Yes |

### Microphone

| Feature | Value |
|---|---|
| Microphone frequency | 20 - 20000 |
| Microphone sensitivity | -42 dB |
| Detachable microphone | Yes |

### Design

| Feature | Value |
|---|---|
| Foldable | Yes |
| On/off switch | Yes |

### Weight & dimensions

| Feature | Value |
|---|---|
| Weight | 0.22 kg |
| Height | 190 mm |
| Width | 175 mm |
| Depth | 80 mm |

### Battery

| Feature | Value |
|---|---|
| Battery technology | Lithium-Ion (Li-Ion) |
| Battery type | Built-in battery |
| Battery capacity | 800 mAh |
| Battery operated | Yes |
| Charging source | USB |

### Operational conditions

| Feature | Value |
|---|---|
| Operating temperature (T-T) | -20 - 60 |

### Packaging data

| Feature | Value |
|---|---|
| Package weight | 350 g |
| Package depth | 85 mm |
| Package height | 170 mm |
| Package width | 153 mm |
| Package type | Hanging box |

### Packaging content

| Feature | Value |
|---|---|
| Cables included | Audio (3.5mm) |

### Logistics data

| Feature | Value |
|---|---|
| Master (outer) case height | 550 mm |
| Master (outer) case width | 360 mm |
| Master (outer) case gross weight | 8400 g |
| Master (outer) case length | 325 mm |
| Products per master (outer) case | 24 pc(s) |
| Master (outer) case volume | 0.0643 cm³ |
| Shipping (inner) case volume | 0.0022 cm³ |

### Music player

| Feature | Value |
|---|---|
| Compatible memory cards | MicroSD (TransFlash) |

### Certificates

| Feature | Value |
|---|---|
| Compliance certificates | RoHS, CE |

## FAQ

### How much does the DEFENDER FreeMotion B400 headset cost, and is it available for purchase?

The price is 25.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 8 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 DEFENDER 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 DEFENDER 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: ear coupling, connectivity technology, weight, wearing style, 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.

### Where can I download the instructions for DEFENDER FreeMotion B400 headset?

You can download the instructions in PDF format from the “Instructions” section on the product description page. The file contains complete information about installation, setup, and usage.

## Image

https://aio.lv/img/cache/product/10900982/62245898_large.webp