We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-27 · 7 min read · Independent comparison
If you want to replace a worn or broken cable on a pair of high-end wired headphones, choose Fezzlo Monitor Headphone Cable; if you need wireless earbuds that stay put during runs and let you hear traffic around you, choose Joysico Open Ear Earbuds.
• Fezzlo Monitor Headphone Cable — biggest strength: A dual 3.5mm OFC replacement cable built for a specific list of audiophile headphones, with a braided tangle-free jacket and a 4.9 ft length.
• Fezzlo Monitor Headphone Cable — biggest trade-off: It only fits the headphone models listed in its compatibility notes, and it does nothing at all for wireless listening — no Bluetooth, no battery, no mic.
• Joysico Open Ear Earbuds — biggest strength: Open-ear hooks that sit outside the ear canal, Bluetooth 5.4, IPX6 sweat resistance, and up to 42 hours of total playtime with the charging case.
• Joysico Open Ear Earbuds — biggest trade-off: The open design trades sound isolation for awareness, so it is a poor fit for planes or very noisy places, and Joysico itself flags that these are not for bass lovers.
• Who each pick is for: Fezzlo is for musicians and audiophiles repairing or upgrading a wired headphone; Joysico is for runners, cyclists and anyone with small or sensitive ears who dislikes in-ear buds.
This is a single-purpose product, and I mean that as a compliment. The Fezzlo Monitor Headphone Cable is a replacement cable — one cable in the box, no headphones, no adapters beyond what the connectors already are. It is a male-to-male auxiliary cable with dual 3.5mm plugs, 4.9 feet long, made with oxygen-free copper conductors inside and a braided nylon outer jacket that is designed to resist tangling. The main line measures roughly 6mm in outer diameter with a twisted-pair core around 3.0mm, and the branch lines come in at about 3.0mm. It carries four cores of 0.06 and two cores of OFC depending on the section, and it meets RoHS.
What it does best is solve a very specific problem: a dead or damaged stock cable on a serious pair of headphones. The compatibility list is unusually wide for this kind of product. It covers Hifiman models including Sundara, Arya, Ananda, HE4XX, HE560, HE400SE, HE-350, HE1000, HE1000 V2 and HE400i — but with an important caveat: only the latest versions of the HE1000 V2 and HE400i that use dual 3.5mm plugs. It also fits Meze 99 Classics and 99 Neo, Denon AH-D600, AH-D7200, AH-D7100, AH-D9200 and AH-D5200, Beyerdynamic T1 second gen, T5P second and third gen, Final d8000 Pro, and Sony MDR-Z1R and MDR-Z7M2.
Buy it if you own one of those headphones and your cable has failed, or if you simply want a spare. At 50 g and 4.9 ft, it is a reasonable desktop length — long enough to reach from a chair to a desk amp, short enough not to coil into a mess on the floor.
Joysico Open Ear Earbuds: Who It's For
The Joysico Open Ear Earbuds are the opposite kind of product: wireless, self-contained, and designed around your environment rather than around isolation from it. The hook shape rests on the outside of the ear rather than plugging the canal, which is the whole point. If you have small ear canals, sensitive ears, or you have simply never found an in-ear bud that stays in, this form factor removes that problem by not entering the canal at all.
The fit story continues with flexible wrap-around ear hooks and a lightweight build — the set weighs 46 g including the case. That combination is what keeps them from bouncing loose during running, cycling, hiking or gym work. Just as important, the open design keeps you aware of cars, other people and general surroundings, which is a genuine safety argument for city jogging and road riding.
On the audio side, Joysico uses 14mm dynamic drivers and Bluetooth 5.4 with a 10m range, quick pairing and auto-reconnect. The brand describes the tuning as clear and balanced, and states plainly that these are not for bass lovers. That honesty is useful: if you want thumping low end, this is not your product. The same goes for noisy environments. Joysico notes that the open design compromises isolation, so planes and other very loud settings are a bad match.
Battery is where these shine. You get about 7 hours per charge with a roughly 1 to 1.5 hour charge time, and up to 42 hours total with the charging case — plus a 10-minute top-up that yields 2 to 3 hours of listening. The case has an LED display for battery and charging status, so you are not guessing. Controls are touch-based: play, pause, track skipping, volume, calls and voice assistants on both iPhone and Android. There is a built-in microphone for hands-free calls, and the earbuds carry IPX6 sweat resistance plus a 1-year warranty.
Buy them if you want situational awareness, a secure hook fit, long battery life and simple touch controls. Skip them if you need noise isolation, deep bass, or a wired connection — there is no headphone jack here at all.
Side-by-Side: Which Should You Choose?
• Best for running, cycling and outdoor workouts → Joysico Open Ear Earbuds. The over-ear hooks and IPX6 rating are built for movement and sweat.
• Best for long sessions away from a charger → Joysico Open Ear Earbuds. Up to 42 hours with the case versus a cable that needs no power at all but tethers you to your gear.
• Best for people with small or sensitive ears → Joysico Open Ear Earbuds. Nothing enters the ear canal, so there is no pressure or fatigue buildup.
• Best for situational awareness → Joysico Open Ear Earbuds. Open-ear design keeps you tuned in to traffic and surroundings; the Fezzlo cable has no bearing on this either way.
• Best for bass-heavy music → Fezzlo Monitor Headphone Cable. It is a conduit for whatever your headphones and amp already do — and Joysico explicitly says the earbuds are not for bass lovers.
• Best for quiet listening at a desk → Fezzlo Monitor Headphone Cable. No Bluetooth latency, no battery, no pairing — just a direct analog connection to your DAC or amp.
• Best for calls and voice assistants → Joysico Open Ear Earbuds. The integrated mic and touch controls cover hands-free calling on iPhone and Android.
• Best for airplane travel → neither, honestly. Joysico admits isolation is compromised, and the Fezzlo cable only helps if you already own compatible wired headphones.
These two products barely compete — they solve different problems, and that is the honest answer. In my opinion, the Fezzlo Monitor Headphone Cable is the smarter buy if you already own one of the compatible headphones and just need it working again, because no wireless product can replace a proper wired connection for that use. But if I were buying for everyday listening, exercise and calls, I would choose the Joysico Open Ear Earbuds: Bluetooth 5.4, IPX6, up to 42 hours and a hook fit that suits small or sensitive ears is a genuinely useful package. My recommendation: Joysico Open Ear Earbuds for most people, and Fezzlo Monitor Headphone Cable specifically as a repair or spare part. Check the current price on Amazon before you commit to either.
FAQ
Only if your model is on the compatibility list and uses dual 3.5mm plugs. It fits Sundara, Arya, Ananda, HE4XX, HE560, HE400SE, HE-350, HE1000, HE1000 V2 and HE400i in their latest dual-3.5mm versions. It does not fit the Deva Pro, or older HE1000 V2 and HE400i units with dual 2.5mm plugs.
No. The open-ear design deliberately lets sound in, which is why they are good for outdoor safety but poor for planes and other very loud environments. Joysico notes the trade-off directly, so treat them as awareness-first earbuds rather than noise blockers.
It depends entirely on what you already own. If your headphones need a new cable, the Fezzlo is the cheaper fix in spirit because it restores gear you already have. If you need a complete wireless listening solution, the Joysico gives you drivers, battery, mic and case in one purchase — a cable alone cannot do any of that.
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