# Headset DEFENDER FREEMOTION B571 LED wireless binaural, 4 cm drivers, 6–8 h battery, closed acoustic, 20–20000 Hz

**URL:** https://aio.lv/en/product--defender-63571--5828080
**Data updated:** 2026-01-21 10:59 (EET)
**Category:** Headphones
**Manufacturer:** DEFENDER
**Manufacturer code:** 63571
**EAN:** 4745090820317
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 20.99 €
**Prices and availability valid until:** 2026-07-27 23:59
**Price without VAT (21%):** 17.35 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--defender-63571--5828080

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 14.07.2026 | free |
| Pickup points | 17.07.2026 | 1.89 EUR |
| Courier delivery to door | 17.07.2026 | 4.99 EUR |

## Summary description

DEFENDER FREEMOTION B571 LED is a binaural headset with wireless connectivity and LED backlight suitable for universal use. It features 4 cm drivers, closed acoustic system, supra-aural ear coupling and frequency range 20–20000 Hz. Operating time is 6–8 hours with a maximum range of 10 m. Comfortable head-band wearing and grey finish make it practical for everyday audio and communication.

## Long description

The Defender FREEMOTION B571 LED headset provides flexible wired and wireless connectivity with Bluetooth, suitable for calls, music playback, sports use and everyday listening. With a frequency response of 20–20000 Hz and a wireless range of up to 10 meters, the headphones deliver a full audio spectrum for voice and media. The supra-aural ear coupling and adjustable head-band design aim to balance comfort and stability while the lightweight construction of approximately 200 grams supports longer wear without excessive pressure.
Advantages
These grey headphones combine wired and wireless modes in one device, allowing users to switch between Bluetooth and a cable connection as needed. The wide frequency range covers low, mid and high frequencies suitable for speech and general music genres. The supra-aural ear pads and head-band wearing style provide a stable fit for active use, while the modest weight reduces strain during extended sessions. Integrated LED elements offer a simple visual accent without affecting primary audio performance.
Suitable for
Voice and video calls — mobile and desktop communication
Listening to music and podcasts at home or on the go
Light sports and fitness activities where on-ear stability is required
Everyday commuting and travel within the Bluetooth range
Key specifications
Connectivity: wired and wireless (Bluetooth)
Frequency range: 20–20000 Hz
Wireless range: up to 10 meters
Ear coupling: supra-aural (on-ear)
Wearing style: adjustable head-band
Weight: approximately 0.2 kg
Colour: grey
How to use
For wireless operation, enable Bluetooth on your source device, put the headset into pairing mode as described in the quick start guide, and select the device name from the list of available devices. For wired use, connect the supplied audio cable to the headset and to the audio output of your device. Wear the headset by placing the ear pads over the ears and adjusting the head-band for a secure, comfortable fit. Adjust volume and call controls using the on-device buttons where available.
Usage recommendations
Use the wired connection when Bluetooth is not available or to conserve headset battery. Keep the device within the specified wireless range for stable audio and minimal latency. Clean the ear pads occasionally with a dry or slightly damp cloth and store the headset in a protective case to prolong component life.

## Specifications

### Headphones

| Feature | Value |
|---|---|
| Headphone frequency | 20 - 20000 |
| Headphone sensitivity | 115 dB |
| Ear coupling | Supraaural |
| 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 | 5.0+EDR |
| Wireless range | 10 m |
| Frequency band | 2.402 - 2.48 |
| Bluetooth | Yes |
| Bluetooth profiles | HSP, HFP, AVRCP, A2DP |
| 3.5 mm connector | Yes |
| Frequency response (music mode) | 20 - 20000 |

### Performance

| Feature | Value |
|---|---|
| Product colour | Grey |
| Volume control | Button |
| Control type | Buttons |
| Detachable cable | Yes |
| Housing material | Metal, Plastic |
| Headset type | Binaural |
| Wearing style | Head-band |
| Operating keys | Answer/end call, Play/pause, Track |
| Sound pressure level (max) | 115 dB |
| Recommended usage | Calls/Music/Sport/Everyday |
| Product type | Headset |
| Music playback | Yes |
| Adjustable headband | Yes |
| Control unit type | On-ear control unit |

### Other features

| Feature | Value |
|---|---|
| Continuous audio playback time | 9 h |
| Backlight colour | Multi |
| Backlight | Yes |

### Microphone

| Feature | Value |
|---|---|
| Microphone frequency | 100 - 16000 |
| Microphone sensitivity | -42 dB |

### Design

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

### Weight & dimensions

| Feature | Value |
|---|---|
| Weight | 0.2 kg |
| Height | 185 mm |
| Width | 175 mm |
| Depth | 75 mm |

### Battery

| Feature | Value |
|---|---|
| Battery technology | Lithium Polymer (LiPo) |
| Battery type | Built-in battery |
| Battery capacity | 400 mAh |
| Battery operated | Yes |
| Charging source | USB |

### Packaging data

| Feature | Value |
|---|---|
| Package weight | 310 g |
| Package depth | 89 mm |
| Package height | 154 mm |
| Package width | 170 mm |
| Package type | Hanging box |

### Logistics data

| Feature | Value |
|---|---|
| Master (outer) case height | 325 mm |
| Master (outer) case width | 550 mm |
| Master (outer) case gross weight | 8500 g |
| Master (outer) case length | 360 mm |
| Products per master (outer) case | 24 pc(s) |

### Sustainability

| Feature | Value |
|---|---|
| Sustainability compliance | Yes |

### Certificates

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

### Music player

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

## FAQ

### How much does the Headset Defender FREEMOTION B571 LED cost, and is it available for purchase?

The price is 20.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 49 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 14.07.2026 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, product colour, wearing style, 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 Headset Defender FREEMOTION B571 LED?

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/5828080/62245889_large.webp