We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-26 · 7 min read · Independent comparison
If you want a wired, ultra-light on-ear headset that just works with a PC, laptop or classroom machine, choose V7 HA310; if you need a wireless, ultra-light open-ear pair for running, cycling and all-day wear, choose mifo FiiTii Z Open. Those two sentences cover about 90% of this decision. One is a plug-in tool built for desks and lessons. The other is a wearable built for movement and long sessions. Everything below is my reasoning from the specs, not from a lab test bench.
• V7 HA310 — biggest strength: a no-fuss wired 3.5 mm on-ear headset with a 1.8 m cable, a 32 ohm dynamic driver and volume control on the remote. Nothing to charge, nothing to pair.
• V7 HA310 — biggest trade-off: it is wired only, has passive noise cancellation rather than active, and its spec sheet lists no water resistance, so sweat and rain are not part of its job description.
• mifo FiiTii Z Open — biggest strength: 5.9 g per earbud, an open-ear curved hook, Bluetooth 5.4, dual-device pairing, IPX5 and up to 8 hours per charge (35 hours with the case).
• mifo FiiTii Z Open — biggest trade-off: open-ear design means you trade isolation for awareness, and it needs charging and a paired device — no plug-and-play fallback.
• Choose V7 HA310 if you want one cable, one jack, zero battery anxiety, and a fit that suits desks, home offices and classrooms.
• Choose mifo FiiTii Z Open if you want freedom from cables, ear-hook comfort that coexists with glasses, and sweat-resistant durability for sport.
The V7 HA310 is an on-ear stereo headset in black and grey, and the spec sheet reads like a product built for a specific kind of buyer: someone who sits down, plugs in, and gets to work. It uses 30 mm dynamic drivers with a 20 Hz – 20,000 Hz frequency range and 32 ohm impedance, which is a sensible, easy-to-drive combination for the 3.5 mm jacks found on PCs, notebooks and portable audio players. The ear pads are described as soft, and the headband is ergonomic and adjustable, which matters more than it sounds when you are wearing something for a two-hour lecture or a full workday of calls and video meetings.
Where it shines is in the complete absence of setup friction. There is no pairing, no charging case, no firmware, no battery percentage to watch. You plug the 1.8 m (70.8 in) cable into a 3.5 mm socket and you are done. The cable comes with a wrap, which is a small detail that tells you who this is designed for — people who toss a headset into a bag between classes or between meetings. Volume control sits on the remote, so you are not reaching for the laptop slider mid-call. It ships with a 2-year manufacturer warranty, and the certifications listed are CE and FCC.
Who should buy it: students, teachers, office workers, call-centre and reception staff, and anyone with a desktop or laptop that still has a headphone jack. Home users who want a dedicated pair for the family computer fit here too. Who should skip it: runners, cyclists, gym-goers and anyone who wants to move around the room without a cable. There is no listed water resistance and no wireless mode, so sweaty workouts and rainy commutes are outside what the design supports. If you need to walk away from your desk while still listening, this is the wrong tool.
The mifo FiiTii Z Open is a completely different animal, and the number that matters most is 5.9 g. That is the weight of a single earbud, and it is the whole design thesis: the brand notes that most open-ear headphones weigh over 10 g, and it built this one to sit under that line. The curved hook design uses an ear-hook radius under 1 mm, which is a deliberate choice aimed at people who wear glasses — a thicker hook generally competes for space behind the ear, and this one is shaped to avoid that fight. The enclosure is plastic, the color is listed as skin, and the carrying case is black, roughly 3.02 × 2.02 × 0.96 inches.
Audio here is a planar magnetic driver, 16 ohm, 20 Hz – 20,000 Hz, paired with a custom large driver and high-quality diaphragm. The brand also describes a low-leakage algorithm and a sound outlet aligned toward the cochlea, which serves two purposes: it reduces how much sound escapes (privacy on a train or in an office) and it lets you listen at lower volume because the output is aimed rather than sprayed. There is ENC call noise cancellation that the brand says reduces wind noise up to around 20 km/h, which is a cycling-relevant claim, not a desk one.
Connectivity is Bluetooth 5.4 with a 12 m range and dual-device pairing, so you can be connected to a laptop and a phone at once and switch between a call and music without re-pairing. Battery is up to 8 hours per charge, with the 400 mAh case extending total playtime to about 35 hours and recharging in around 2 hours. IPX5 covers sweat and light rain. Controls are touch, and there is no active noise cancellation — by design, since open-ear means you keep your surroundings audible.
Who should buy it: runners, cyclists, gym users, outdoor walkers, glasses wearers, and anyone who wants music without blocking out traffic, colleagues or family. Who should skip it: people who want deep isolation on a plane, and anyone who dislikes touch controls or managing a charge cycle. The warranty is 1 year, shorter than the V7's 2 years.
• Best for zero setup and no charging → V7 HA310. Wired 3.5 mm, volume on the remote, nothing to pair.
• Best for sport and movement → mifo FiiTii Z Open. 5.9 g per bud, IPX5, secure curved hook, open-ear awareness.
• Best for battery life → mifo FiiTii Z Open. Up to 8 hours per charge and up to 35 hours with the case, versus no battery at all for the V7.
• Best for glasses wearers → mifo FiiTii Z Open. The sub-1 mm ear-hook radius is specifically shaped to sit alongside frames.
• Best for desk, office and classroom use → V7 HA310. On-ear pads, adjustable headband, 1.8 m cable, and a design explicitly aimed at office, home and education.
• Best for switching between two devices → mifo FiiTii Z Open. Bluetooth 5.4 dual-device pairing lets you jump between a laptop and a phone.
• Best for calls in wind → mifo FiiTii Z Open. ENC call noise cancellation is aimed at wind noise up to roughly 20 km/h.
• Best for long wired sessions with no interruption → V7 HA310. No charge state, no dropouts, no pairing failures — the cable is the reliability feature.
In my opinion, the honest answer is that these two barely compete — they compete for your routine. If your listening happens at a fixed spot with a 3.5 mm jack nearby, I would buy the V7 HA310. It is the lower-maintenance product by design: plug in, adjust the headband, use the remote volume, and the 2-year warranty backs it up. If your listening happens while moving — runs, rides, gym sessions, walking the dog — I would buy the mifo FiiTii Z Open. At 5.9 g per bud with a glasses-friendly hook, IPX5 and up to 35 hours total, it is the one built for the version of your day where a cable would be a nuisance. Pick the one that matches where you actually listen.
No. It connects through a 3.5 mm jack with a 1.8 m (70.8 in) cable. The spec sheet lists Bluetooth under wireless technology, but the product is a wired on-ear headset — the plug is how it connects to PCs, notebooks and portable players.
That is clearly their intended use. They weigh 5.9 g per earbud, use a curved hook for stability, carry an IPX5 rating for sweat and light rain, and add ENC call noise cancellation aimed at wind noise up to about 20 km/h.
Neither isolates heavily, but they differ in approach. The V7 HA310 uses passive noise cancellation from its on-ear pads, so it muffles some surrounding sound. The mifo FiiTii Z Open has no noise cancellation and an open-ear fit, so you stay aware of traffic and people around you.
The mifo FiiTii Z Open, obviously — the V7 HA310 has no battery because it is wired. The mifo gives up to 8 hours per charge and up to 35 hours total with its 400 mAh case, recharging in about 2 hours. If battery life is your deciding factor, that settles it.
I do not quote prices here, and both change over time. Check the current price on Amazon using the button on this page and compare them against your own priorities — wired reliability versus wireless freedom.
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