Sennheiser CX 300S wired in-ear headset

Name: Sennheiser wired in-ear headset CX 508593
Brand: Sennheiser
SKU: 4257451
Price: 42.49 EUR
Availability: InStock

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Sennheiser wired in-ear headset CX 300S — intraaural, 1.2 m cable, black

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Short description

Sennheiser CX 300S is a wired in-ear headset designed for calls and music. It features intraaural ear coupling, a 1.2 m cable for stable wired connection, and a compact in-ear wearing style in black. Suitable for mobile devices and portable players, it offers reliable wired audio for everyday listening and voice calls.

Available for order: 1 pcs.

Warranty: 2 Years

SKU: 4257451

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Deliver the order:

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to the Customer Service Center at Kengaraga 2b, Riga

01.07.2026 {{selectedOffer.officeDeliveryString}}

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Customer service center

2b. Kengaraga str., Riga, Latvia, LV-1063

01.07.2026 {{selectedOffer.officeDeliveryString}}

free

Courier Delivery Please note that in case of a large parcel additional delivery costs may apply!

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From 9.89 € (Weight: 12.00 kg)

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Latvijas Pasts pakomāts / Unisend / DPD Paku skapis / Omniva / Venipak Locker / Latvijas Pasts nodaļa

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From 1.99 €

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Payment Methods:

Bank transfer, Bank cards on-line, Apple Pay, Google Pay

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Product information

Description

Sennheiser wired in-ear headset CX 300S is a compact wired in-ear headset designed for calls and music. The intraaural ear coupling provides close-fitting ear contact for improved isolation from ambient noise. With a 1.2 m cable and a standard 3.5 mm connection, the CX 300S offers a stable wired link to mobile devices and portable players. The headset is supplied in black and includes multiple ear adapter sizes to support a customized in-ear fit.

Advantages

The CX 300S includes a built-in microphone and remote that let you manage calls and control playback without reaching for your device. Its ergonomic in-ear design reduces external noise for more focused listening and clearer voice pickup during calls. The cable is designed to resist tangling and everyday wear, supporting reliable wired audio performance. Sennheiser transducer design delivers detailed sound reproduction and pronounced bass response while keeping a compact in-ear form factor.

Suitable for

Listening to music on smartphones and portable players
Making and receiving voice calls with the inline microphone
Commuting and travel where ambient noise isolation is useful
Everyday wired listening when battery-free operation is preferred

Key specifications

Ear coupling: intraaural (in-ear)
Connectivity: wired
Cable length: 1.2 m
Standard connector: 3.5 mm
Nominal impedance: 18 Ω
Sensitivity: 118 dB
Included ear adaptor sizes: XS, S, M, L
Weight: 12 g

How to use

Insert the ear adapters that best match your ear canal size for a secure, comfortable fit and optimal isolation. Plug the 3.5 mm connector into your device's headphone jack. Use the inline remote to answer or end calls and to pause or resume music playback. Position the cable so it lies comfortably over or behind your ears to reduce microphonics and cable noise during movement. After use, store the earphones and accessories in the supplied pouch to protect them from damage and tangling.

Usage recommendations

For best audio and call performance, select the ear adapter size that creates a snug seal in your ear canal. Keep volume at moderate levels to protect hearing and reduce distortion. When not in use, coil the cable loosely and keep the earphones in the storage pouch supplied to extend their service life.

Specifications

Ear coupling:: Intraaural
Connectivity technology:: Wired
Cable length:: 1.2 m
Weight:: 12 kg
Product colour:: Black
Wearing style:: In-ear

All features

Headphones

Headphone frequency:: 17 - 21000
Headphone sensitivity:: 118 dB
Impedance:: 18 Ω
Ear coupling:: Intraaural
Acoustic system:: Closed

Ports & interfaces

Connectivity technology:: Wired
Bluetooth:: No
Microphone in:: Yes
USB connectivity:: No
3.5 mm connector:: Yes
2.5 mm connector:: No
6.35 mm connector:: No
RF connectivity:: No

Performance

Cable length:: 1.2 m
Product colour:: Black
Total Harmonic Distortion (THD):: 0.5 %
Volume control:: Buttons
Headset type:: Binaural
Wearing style:: In-ear
Sound pressure level (max):: 118 dB
Recommended usage:: Calls/Music
Product type:: Headset

Other features

Material:: Rubber, Silicone
Pouch:: Yes

Microphone

Microphone frequency:: 100 - 10000
Microphone sensitivity:: 44 dB
Noise-canceling:: Yes

Weight & dimensions

Weight:: 12 kg

Packaging content

Accessories included in set:: 4 sizes silicone eartips

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Customer questions

FAQ

How much does the Sennheiser CX 300S wired in-ear headset cost, and is it available for purchase?

The price is 42.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 1 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 01.07.2026 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 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. 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: ear coupling, connectivity technology, cable length, 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.

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