Sennheiser CX 300S wired in-ear headset

Name: Sennheiser wired in-ear headset CX 508593
Brand: Sennheiser
SKU: 4257451
Price: 45.99 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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Cheapest delivery:

Unisend LV

Pick-up points

Unisend LV

Cost

1.99 €

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Customer service center

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

21.10.2026 {{selectedOffer.officeDeliveryString}}

free

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

26.10.2026 {{selectedOffer.courierDeliveryString}}

From 9.89 € (Weight: 12.00 kg)

Parcel couriers

Unisend LV / Venipak Locker LV / DPD Paku skapis / Omniva LV / Latvijas Pasts pakomāts / 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: Ear coupling describes the way in which headphones or earphones stay attached to, or inside, the ear. There are three common types of ear coupling: circumaural, supra-aural and intra-aural. Circumaural headphones enclose your ears with large pads that suppress external noise. Supra-aural headphones are typically more lightweight and sit on top of the ears with small pads. Intra-aural headphones come in two basic designs and neither style sits on the head itself. The first are ear buds, which sit just outside of the ear canal, on top of your ear lobes. The second type is actually inserted directly into the ear canal and offers some external noise suppression.: Intraaural
Connectivity technology: The technology that enables connectivity of the device, e.g. wired or wireless.: Wired
Headset type: A headset is headphones combined with a microphone, or one headphone with a microphone. Headsets provide the equivalent functionality of a telephone handset but with hands-free operation. Types of headsets include single earpiece (monaural) and double earpiece.: Binaural
Recommended usage: What the product should be used for, and how it should be used (e.g. ambient temperature).: Calls/Music
Product type: The sub-category of the product.: Headset
Product colour: The colour e.g. red, blue, green, black, white.: Black
Wearing style: The way in which the device is worn.: In-ear

All features

Other features

2.5 mm connector:: No

Supplier features

Material: The material from which a thing is or can be made e.g. wood, plastic.: Silicone, Rubber

Packaging content

Pouch:: Yes
Accessories included in set:: 4 sizes silicone eartips

Weight & dimensions

Weight: Weight of the product without packaging (net weight). If possible, the net weight is given including standard accessories and supplies. Please note that sometimes the manufacturer leaves out the weight of accessories and/or supplies.: 12 kg

Microphone

Noise-canceling:: Yes
Microphone sensitivity:: 44 dB
Microphone frequency: The range of frequencies (low to high sounds) that the microphone can pick up (detect).: 100 - 10000

Headphones

Total Harmonic Distortion (THD): Total harmonic distortion is a measure of non-linear harmonic distortion and is given in %. Non-linear harmonic distortions are signals which were not present in the original before the signal was converted by the headphones. These unwanted signals are caused by the diaphragm, whose movements do not precisely move in time with the electric signals that cause it to move. Unfortunately, this is a feature of all electroacoustic transducers. Although it cannot be completely eliminated, suitable steps can be taken to minimise it. However, the user is not interested in why this distortion takes place but in how great the level of distortion must be for it to become perceptible. According to the findings of several research projects, a total harmonic distortion of 1% in the frequency range of 100 to 2000 Hz is imperceptible. Below 100 Hz, the perceptibility threshold lies at 10%.: 0.5 %
Headphone sensitivity:: 118 dB
Impedance: The effective resistance of an electric circuit or component to alternating current, arising from the combined effects of ohmic resistance and reactance.: 18 Ω
Headphone frequency: The range of frequencies (low to high sounds) that the headphones can produce.: 17 - 21000
Acoustic system:: Closed
Ear coupling: Ear coupling describes the way in which headphones or earphones stay attached to, or inside, the ear. There are three common types of ear coupling: circumaural, supra-aural and intra-aural. Circumaural headphones enclose your ears with large pads that suppress external noise. Supra-aural headphones are typically more lightweight and sit on top of the ears with small pads. Intra-aural headphones come in two basic designs and neither style sits on the head itself. The first are ear buds, which sit just outside of the ear canal, on top of your ear lobes. The second type is actually inserted directly into the ear canal and offers some external noise suppression.: Intraaural

Ports & interfaces

RF connectivity:: No
Microphone in: The socket where a microphone is connected to the device.: Yes
Bluetooth: Bluetooth is a low-power radio technology developed to replace the cables and wires currently used to link or connect electronic devices such as personal computers, printers, and a wide variety of handheld devices including mobile phones. Because it uses radio-wave connectivity, a Bluetooth-enabled device has a constant, established connection to whatever browser it uses. This saves the user the trouble of logging on to check for emails or news updates, for example.: No
USB connectivity: The product has USB connector.: No
6.35 mm connector:: No
3.5 mm connector:: Yes
Connectivity technology: The technology that enables connectivity of the device, e.g. wired or wireless.: Wired

Performance

Sound pressure level (max):: 118 dB
Cable length: How long the cable is.: 1.2 m
Volume control:: Buttons
Product colour: The colour e.g. red, blue, green, black, white.: Black
Headset type: A headset is headphones combined with a microphone, or one headphone with a microphone. Headsets provide the equivalent functionality of a telephone handset but with hands-free operation. Types of headsets include single earpiece (monaural) and double earpiece.: Binaural
Recommended usage: What the product should be used for, and how it should be used (e.g. ambient temperature).: Calls/Music
Wearing style: The way in which the device is worn.: In-ear
Product type: The sub-category of the product.: Headset

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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 45.99 € (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 21.10.2026 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, headset type, recommended usage, product type, 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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Sennheiser wired in-ear headset CX 300S — intraaural, 1.2 m cable, black

Short description

Product information

Description

Advantages

Suitable for

Key specifications

How to use

Usage recommendations

Specifications

Other features

Supplier features

Packaging content

Weight & dimensions

Microphone

Headphones

Ports & interfaces

Performance

Description

Similar products

Product comparison

Customer reviews

Customer questions

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

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

What payment options are available?

Can this product be purchased for a company (with VAT)?

What is the warranty period?

Can the product be returned after purchase?

Where should I contact for warranty service?

How can I tell if this product suits my needs?