# In-ear headphones Sennheiser CX 400-II black — wired earphones with noise isolation

**URL:** https://aio.lv/en/product--sennheiser-502743--11119110
**Data updated:** 2026-02-25 19:48 (EET)
**Category:** Headphones
**Manufacturer:** Sennheiser
**Manufacturer code:** 502743
**EAN:** 4044155043068
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 40.99 €
**Prices and availability valid until:** 2026-07-15 23:59
**Price without VAT (21%):** 33.88 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--sennheiser-502743--11119110

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 16.07.2026 | free |
| Pickup points | 21.07.2026 | 1.99 EUR |
| Courier delivery to door | 21.07.2026 | 4.99 EUR |

## Summary description

Sennheiser CX 400-II are in-ear wired headphones in black designed for personal audio listening with noise isolation. They provide a compact fit for everyday use, commuting and casual music listening. The model focuses on clear sound reproduction and passive noise reduction through snug-fitting ear tips, offering practical portability and convenience for on-the-go use.

## Long description

Sennheiser CX 400-II black are wired in-ear headphones designed for personal audio listening with passive noise isolation. The compact form and ergonomic ear tips provide a snug fit for everyday use, commuting and casual music listening. The model emphasizes clear sound reproduction across frequencies and practical portability, making it suitable for users who need reliable wired earphones with focused audio performance and minimal external noise intrusion.
Advantages
These in-ear earphones combine Sennheiser acoustic tuning with a compact wired design, delivering defined mids and highs and balanced bass for a wide range of music genres. The passive noise isolation relies on interchangeable silicone ear tips to reduce ambient sounds without requiring active electronics. The compact housing and braided cable enhance durability and portability while maintaining a straightforward plug-and-play connection for devices with a compatible audio jack or adapter.
Suitable for
Daily commuting and urban travel
Casual music listening at home or outdoors
Phone calls and voice communication with compatible devices
Portable use with laptops, tablets and music players
Key specifications
Form factor: in-ear, wired
Noise control: passive isolation via snug silicone ear tips
Sound signature: balanced tuning with clear mids and highs
Cable: durable, tangle-resistant design with 3.5 mm connector compatibility
Fit: ergonomic compact housings with multiple ear tip sizes included
How to use
Select the silicone ear tips that provide the best seal for your ear canal and attach them securely to the earphone nozzles. Insert each earphone gently into the ear and adjust until you feel a comfortable, snug fit that provides passive noise isolation. Connect the 3.5 mm plug to a compatible device or use an appropriate adapter if needed. Control playback and calls using the connected device or inline remote if present on your specific cable variant.
Usage recommendations
To maintain sound quality and fit, clean the ear tips regularly and replace them if they show signs of wear. Store the earphones in a protective case when not in use to prevent cable damage and to keep the housings free from dust. For best passive noise isolation, try different tip sizes to find the optimal seal for your ears.

## FAQ

### How much does the In-ear headphones Sennheiser CX 400-II cost, and is it available for purchase?

The price is 40.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 50 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 16.07.2026 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. 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 Sennheiser 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 Sennheiser 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

## Image

https://aio.lv/img/cache/product/11119110/61815352_large.webp