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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-25 · 7 min read · Independent comparison
• UKELALA U2 — biggest strength: A two-pack of on-ear wired headphones with a stainless-steel retractable structure, a foldable frame and a soft, breathable headband built for long wear by kids and students.
• UKELALA U2 — biggest trade-off: It's an on-ear design with sound isolation only — no microphone, no inline controls and no USB-C adapter, so it's for listening, not calls.
• MartiAudio Over Ear Headphones — biggest strength: A single over-ear pair with a 40 mm dynamic driver, an in-line mic with push-button controls and a bundled USB-C adapter for 3.5 mm or USB-C devices.
• MartiAudio Over Ear Headphones — biggest trade-off: It's sold as one unit, not a pair, and its over-ear fit is bulkier than the U2's on-ear, school-friendly shape.
• Who each pick is for: UKELALA U2 for families, students and travelers who want two light, foldable, plug-and-play sets; MartiAudio for one adult who wants a mic, call controls and wider port compatibility.
The UKELALA U2 is a wired on-ear headphone that leans hard into being practical rather than fancy. The retractable structure uses stainless steel, which is the kind of detail that matters when headphones get shoved into backpacks, dropped on school floors or handed between siblings. The soft headband and over-head design are described as breathable, so the goal here is comfort over long stretches — a study session, a long flight, a car ride — rather than a tight audiophile clamp.
The specs are simple and honest: a dynamic driver covering 20 Hz to 20,000 Hz, a 3.5 mm wired jack, sound isolation, and a plastic enclosure in a green-and-blue colorway. It ships as a two-pack, and the folding design shrinks each set down for storage and travel. Compatibility is broad on paper — anything with a 3.5 mm jack, from phones and tablets to Chromebooks, laptops, PCs, the Switch, Kindle and MP3 players. There's a one-year warranty and the age range is listed for both adults and kids.
In my opinion, this is the pair to buy if you're equipping more than one person or you want a spare set that lives in a bag. Kids, students and casual travelers get the most from it. Skip it if you need a microphone for calls or meetings, if you want inline volume buttons on the cable, or if you prefer the fuller, more enclosing feel of an over-ear cup — the U2 is on-ear and gives you sound isolation only, no mic and no controls.
The MartiAudio Over Ear Headphones are aimed at one adult who wants a single, do-everything wired set. The headline is the audio hardware: a 40 mm dynamic driver, 40 ohm impedance, 94 dB sensitivity and a 20 Hz–20 kHz frequency range, paired with a closed-back design that the brand says enhances noise isolation. Closed-back over-ear cups are the classic choice when you want to block out an office, a bus or a noisy study space without turning the volume up.
Where it pulls ahead of the U2 on features is the cable and controls. There's a braided, tangle-resistant cable with a built-in in-line microphone, plus push-button controls for volume, play/pause and taking calls. A USB-C adapter is included, so the same set works with a 3.5 mm jack or a USB-C port — phones, tablets, laptops, Chromebooks and more. The over-ear cushions use protein leather and memory foam, and the adjustable headband is meant to spread pressure so long sessions stay comfortable.
The build details support a commuter-and-work story too: a foldable frame, reinforced headband and hinges, and a two-year manufacturer warranty. It's heavier than the U2 at 7.68 ounces, and it's a single unit, not a two-pack.
Buy it if you take calls, join meetings, want volume control at your fingertips and need the USB-C option. Skip it if you're buying for young kids, want two sets for the price of one setup, or prefer a lighter on-ear fit — the over-ear build is bulkier and the mic/cable setup is more than a child needs.
Side-by-Side: Which Should You Choose?
• Best for two people (or a spare set) → UKELALA U2. It ships as a two-pack; MartiAudio is a single unit.
• Best for USB-C devices → MartiAudio Over Ear Headphones. The included USB-C adapter covers phones, tablets and laptops without a 3.5 mm port.
• Best for kids and school → UKELALA U2. On-ear, lightweight, folding design with a stainless-steel retractable structure and a breathable headband.
• Best for blocking out noise → MartiAudio Over Ear Headphones. Closed-back over-ear cups with sound isolation; the U2 is on-ear with sound isolation only.
• Best for long listening comfort → MartiAudio for adults (memory foam and protein leather over-ear pads), UKELALA U2 for kids (soft, breathable headband built for long wear).
• Best for travel storage → both fold, but the U2 also folds down small as a two-pack; MartiAudio folds as one set.
• Best for durability confidence → MartiAudio lists a two-year manufacturer warranty; UKELALA U2 lists a one-year warranty.
If I were buying for myself — someone who takes calls, works across a laptop and a phone, and wants volume control on the cable — I'd pick the MartiAudio Over Ear Headphones. The 40 mm driver, closed-back over-ear fit, in-line mic, push-button controls and USB-C adapter make it the more complete single set for work and daily listening, and the two-year warranty is the longer of the two.
But if the job is "headphones for the kids" or "two sets we can toss in bags," I'd take the UKELALA U2 every time. Two foldable on-ear sets with a stainless-steel retractable structure and a breathable headband is exactly the brief for school, travel and shared devices. In my opinion, the right answer comes down to who is wearing them, not which one is "better" in the abstract.
Connection is the first step, then volume and balance. The UKELALA U2 is a plain 3.5 mm wired set with no inline controls, so on an iPhone you'd adjust volume on the phone itself (or via a 3.5 mm adapter if your iPhone lacks the jack). The MartiAudio set includes a USB-C adapter and inline push-button controls, so you can change volume and play/pause from the cable.
For fit, use the headband. The UKELALA U2 has a soft over-head band and a folding frame sized for on-ear wear; the MartiAudio has an adjustable headband plus over-ear memory foam cushions, so you slide the band to set a personalized fit and reduce pressure. Neither requires tools — it's a slide-and-settle adjustment.
Two ways: at the source, or on the cable. The MartiAudio Over Ear Headphones have built-in in-line controls for volume and play/pause, so you can adjust without touching your device. The UKELALA U2 has no inline controls, so volume is handled on the connected phone, tablet, laptop or other 3.5 mm device.
Physical adjustments are limited to fit and seal — a proper over-ear seal on the MartiAudio's closed-back cups helps with isolation and bass response, and a good on-ear fit on the U2 keeps levels consistent. Beyond that, EQ and audio settings live in your phone, laptop or app, not on either headphone. Neither model ships with an app or a built-in equalizer.
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See also: Uliptz Headphones Over Ear vs Matast Ear Buds, DOQAUS Headphones Over Ear vs Kelazola Headset V5.3, Panasonic RP-HJE125E-W vs PowerLocus Over-Ear Headphones