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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-20 · 7 min read · Independent comparison
• itayak Behind — biggest strength: Bluetooth 5.0 wireless freedom with a behind-the-head, open-ear fit that stays put during sweaty workouts, plus roughly 11 hours of music playback and a 33 ft connection range.
• itayak Behind — biggest trade-off: It runs on a rechargeable battery, so it needs recharging every few days, and its 20Hz–20,000Hz dynamic driver can't match the frequency spread of the Koss.
• Koss KTXPro1 — biggest strength: Titanium-coated 60 ohm drivers covering a wide 15Hz–25,000Hz range, with an in-line volume control and a limited lifetime warranty — no battery, no charging, no pairing.
• Koss KTXPro1 — biggest trade-off: It's wired with a 3.5mm plug, so your phone or laptop must have a headphone jack, and there's no microphone or Bluetooth for calls.
• Who each pick is for: Choose itayak Behind for wireless sport and calls; choose Koss KTXPro1 for wired, retro-styled fidelity at a desk, on a CD player or with older gear.
The itayak Behind is built around one idea: get the headphones out of your way while you move. It uses a behind-the-head neckband design with open-ear earpieces that rest outside the ear canal rather than plugging into it. That shape matters for two reasons. First, it means nothing is jammed into your ear for an hour-long run. Second, it lets you still hear traffic, a gym announcement or a training partner while your music plays.
At roughly 37 grams, it's genuinely light — the kind of weight you stop noticing after a few minutes. The build is plastic, and it folds down small enough to drop into the included carrying case or a jacket pocket. It's IPX5 sweatproof, so sweat from a run or a hard gym session won't be the thing that kills it. And the earbuds are shaped to sit securely, which is the whole point of the neckband format: the band does the holding, not friction inside your ear.
On the tech side, it's Bluetooth 5.0 with a stated range of about 33 feet, which is normal room-to-room territory. Battery life is the headline number here: more than 11 hours of music, 14 hours of talk time, and 200 hours on standby, from a 3-hour charge. Five physical control buttons handle power, volume, track skipping, play/pause, call answer/hang up/reject, and even triggering Siri or Google Assistant. There are two features I want to flag specifically: the sound isolation is passive (it filters background noise rather than actively cancelling it), and your phone will display the headset's battery level when connected — a small thing that saves you from guessing.
Who should buy it: runners, cyclists, gym-goers, warehouse and delivery workers, and anyone who takes a lot of calls and hates wires snagging on everything. The open-ear fit is also a natural pick for people who find in-ear buds uncomfortable or prone to falling out.
Who should skip it: critical listeners who want the widest possible frequency response, anyone whose device has no Bluetooth, and people who simply don't want another gadget to charge. If your priority is fidelity rather than freedom, this isn't your headphone.
The Koss KTXPro1 is the opposite philosophy, and it's unapologetic about it. This is a wired, on-ear headphone with a 3.5mm plug — the connector that's been on CD players, cassette decks, desktops, tablets and laptops for decades. You plug it in and it works. No pairing screen, no firmware, no low-battery beep in the middle of a song.
The core of the headphone is its driver. Koss uses titanium-coated 60 ohm dynamic drivers rated from 15Hz to 25,000Hz. That's a wider spread than the itayak's 20Hz–20,000Hz on both ends — deeper into the bass and higher into the treble. The 60 ohm impedance and 103 dB sensitivity spec also tells you something practical: this isn't a headphone that needs a fancy amp, but it does want a source with a bit of output, which is exactly why it's aimed at computers, tablets, laptops and home audio gear rather than tiny dongles.
Comfort comes from plush foam cushions plus an adjustable headband with a soft, flexible head sling — the classic Koss approach that spreads pressure instead of clamping. The design is deliberately retro, dating back to a model introduced in 2002, and it's available in clear, black and silver depending on the version. It's made of plastic but engineered for daily abuse, and Koss backs it with a limited lifetime warranty — a meaningful statement about how long they expect it to last.
There's also an in-line volume control on the cable, so you can nudge the level without digging your phone out of a pocket. What there isn't: a microphone, Bluetooth, sweatproofing, or a carrying case.
Who should buy it: desk workers and students on laptops, retro-audio fans, anyone with a CD player, cassette deck or older stereo, and listeners who want a wired connection that never needs charging and never drops out.
Who should skip it: runners and gym users (no sweat rating and a cable to manage), anyone whose phone has no 3.5mm jack, and people who need to take calls hands-free from the headset itself.
• Best for wireless freedom → itayak Behind. Bluetooth 5.0 with roughly 33 ft of range, no cable to snag on a treadmill or a door handle.
• Best for sound quality on paper → Koss KTXPro1. The 15Hz–25,000Hz titanium-coated 60 ohm driver reaches wider at both ends than the itayak's 20Hz–20,000Hz dynamic driver.
• Best for workouts and sweat → itayak Behind. IPX5 sweatproofing and a secure behind-the-head fit; the Koss has neither a sweat rating nor a sport-oriented design.
• Best for battery anxiety → Koss KTXPro1. It has no battery at all. The itayak needs about 3 hours to charge and gives you roughly 11 hours of music per charge.
• Best for calls and voice assistants → itayak Behind. Built-in microphone, call answer/hang up/reject controls, and Siri/Google Assistant activation. The Koss is music-only.
• Best for long-term ownership → Koss KTXPro1. A limited lifetime warranty against the itayak's 1-year warranty.
• Best for travel and storage → itayak Behind. It folds and ships with a carrying case for pocket or pouch storage.
• Best for legacy and home audio gear → Koss KTXPro1. A standard 3.5mm plug connects to CD players, cassette players, computers, tablets and laptops with zero setup.
If I had to pick one, I'd take the Koss KTXPro1 — but only because my listening happens at a desk, where a wire is a non-issue and the wider 15Hz–25,000Hz titanium driver range plus the in-line volume control and limited lifetime warranty are exactly what I want. That said, I'd recommend the itayak Behind without hesitation to anyone whose listening happens while moving: 37 grams, IPX5 sweatproofing, 11+ hours per charge and a microphone make it the far more practical choice for running, commuting and calls. In my opinion, the deciding question isn't which is better — it's whether your ears are attached to a cable or a battery.
The itayak Behind, clearly. It's IPX5 sweatproof, weighs about 37 grams, uses a secure behind-the-head fit, and has no cable to tangle. The Koss KTXPro1 is a wired on-ear headphone with no sweat rating, so it's better suited to desk and home listening.
Does the Koss KTXPro1 have Bluetooth or a microphone?
Per the specs, about 11 hours of music, 14 hours of talk time and 200 hours on standby from a roughly 3-hour charge. Your connected Bluetooth device displays the headset's battery level, so you can see when it's time to plug in.
On paper, the Koss KTXPro1 has the wider frequency response — 15Hz to 25,000Hz versus 20Hz to 20,000Hz — with titanium-coated 60 ohm drivers. The itayak Behind uses a dynamic driver with sound isolation. Which you prefer also depends on whether you want wireless convenience or a wired connection.
I don't quote prices here because they change constantly. Use the "Check latest price on Amazon" button on this page to see the current price for whichever model you're leaning toward before you decide.
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