If you want compact in-ear headphones with multiple tip sizes and an inline music-and-call button, choose Sennheiser CX 300S; if you need over-ear headphones with cushioned ear pads, choose Sony Sony mdrzx110. For kids, I’d lean toward the Sennheiser when a secure in-ear fit is welcome, and toward the Sony when an over-ear style is the better match.
Sennheiser CX 300S vs Sony Sony mdrzx110 at a Glance
• Sennheiser CX 300S: Its in-ear design, four included tip sizes, and one-button remote are its biggest strengths. The trade-off is that fit matters, and the wired design offers no Bluetooth.
• Sony Sony mdrzx110: Its over-ear placement and cushioned ear pads suit listeners who prefer headphones that sit around the ears. The trade-off is a simple wired setup without the Sennheiser’s listed four tip sizes or one-button inline remote.
• Choose Sennheiser for a compact in-ear style, tip-size options, and convenient music and call controls.
• Choose Sony for an over-ear design with ear cushions and a cable connection.
• For kids: match the style to the child’s comfort and needs; neither model is listed as wireless.
The CX 300S is an in-ear headphone set with a 3.5 mm jack and a one-button inline remote. That button is listed for playing or pausing music and taking calls, so the listener can handle those basic tasks without reaching for the connected phone or other device. It is a useful detail for a child listening from a compatible phone, tablet, or computer, or for anyone who wants simple controls on the cable.
Fit is central to this model. Four silicone ear-adapter sizes—XS, S, M, and L—are included, giving the listener more options for a snug and comfortable fit. The in-ear design is also intended to reduce ambient noise through sound isolation. The sheet describes detailed sound with enhanced bass, and lists a dynamic driver, 18-ohm impedance, and a frequency range of 17 Hz to 21,000 Hz. Those figures describe the product; they do not guarantee that every listener will hear it the same way.
How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-19 · 7 min read · Independent comparison
Who should skip it: Skip the CX 300S if the listener dislikes earbuds in the ear canal, needs a wireless connection, or does not want to spend time finding a suitable tip size.
The Sony MDR-ZX110 is a wired, over-ear headphone with rounded earpieces, plastic enclosure material, and ear cushions listed as included. Its 3.5 mm jack makes it a straightforward option for compatible devices that have that connection. Unlike an in-ear design, it rests around the ears, which can make it a more natural style for someone who prefers not to insert earbuds.
Sony lists 30 mm dynamic drivers, 24-ohm impedance, and a frequency range of 12 Hz to 22 kHz. The figures offer a point of comparison with the Sennheiser, but they do not establish which headphone will sound better to a particular listener. The Sony sheet identifies sound isolation and media and call control, but does not provide the same specific description of a one-button inline remote for play, pause, and calls that appears for the CX 300S.
For a child who prefers over-ear headphones, the padded-earpiece design may be the more comfortable starting point. It is also a simpler choice for wired listening without managing interchangeable in-ear tips. The trade-off is that the product information gives no Bluetooth option, and its over-ear form is less compact than an in-ear set. Its listed age range is adult, so parents should consider fit and comfort rather than treating the name or style as a child-specific fit.
Who should skip it: Skip the Sony if you want in-ear headphones, multiple ear-tip sizes, or the clearly specified one-button playback and call remote found on the Sennheiser.
• Best for a listener who wants interchangeable ear tips → Sennheiser CX 300S. It includes four silicone sizes: XS, S, M, and L.
• Best for someone who prefers over-ear placement → Sony Sony mdrzx110. Its listed design uses over-ear earpieces and ear cushions.
• Best for a clearly specified inline music-and-call button → Sennheiser CX 300S. Its one-button remote handles play, pause, and calls.
• Best for reducing ambient sound through an in-ear fit → Sennheiser CX 300S. Its in-ear design is described as reducing ambient noise, with the caveat that a good fit matters.
• Best for a child who dislikes earbuds → Sony Sony mdrzx110. The over-ear style avoids placing an earpiece in the ear canal, though comfort still depends on the individual.
• Best for listening through a 3.5 mm jack → Either. Both are listed as wired headphones with a 3.5 mm connection; check that the intended device has a compatible jack.
• Best wireless headset for kids → Neither. Both products are wired, so neither is a Bluetooth headset.
• Best match for someone searching for Bluetooth earbuds for kids → Neither. The Sennheiser is an in-ear model, but it still connects by cable rather than Bluetooth.
My Verdict
Before choosing, check the listening device. Both headphones use a 3.5 mm jack, so neither offers Bluetooth, and a device without a compatible headphone connection may not suit either one. The product sheets do not list wireless features for these models. That makes them a poor match for someone whose main requirement is a wireless connection, whether they are shopping for gaming headphones for kids or everyday listening.
Next, consider how the listener likes headphones to sit. The CX 300S goes in the ear and includes four tip sizes. That gives the user options, but the seal and comfort depend on selecting a tip that fits. The Sony sits over the ears and includes ear cushions, which may appeal to someone who does not like earbuds. Neither design is automatically more comfortable for every child.
Control needs are another useful distinction. Sennheiser specifically lists a one-button inline remote for play, pause, and calls. Sony lists media and call control, but its product information does not spell out an equivalent one-button layout. If simple on-cable control is a priority, the Sennheiser has the clearer specification.
Finally, keep expectations tied to the listed features. Both have dynamic drivers and sound-isolation information, but those details alone do not settle which will sound better to a particular listener. For a price comparison, check the current Amazon listing; I’m not using price as a basis for this recommendation.
No. Both are listed as wired headphones with a 3.5 mm jack. Neither is described as Bluetooth or as a wireless headset.
It depends on which style the child finds comfortable. The Sennheiser includes four ear-adapter sizes, while the Sony uses an over-ear design with ear cushions. Both sheets describe the age range as adult, so neither is specifically identified as a children’s model.
Does the Sennheiser CX 300S reduce outside noise?
The Sennheiser has a clearly specified one-button inline remote for play, pause, and calls. Sony’s information lists media and call control but does not give the same specific description of the control layout.
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