We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-19 · 7 min read · Independent comparison
If you want serious hearing protection with a microphone built in for long, loud workdays, choose inf protear E6850; if you need featherweight open-ear earbuds for workouts and calls, choose Monster Open Ear AC600. These two products get lumped together because both are Bluetooth audio devices, but they solve completely different problems. One is a piece of safety gear that happens to play music. The other is a pair of fitness earbuds that happens to be comfortable. Let me break down which one actually fits your life.
• inf protear E6850 — biggest strength: It is hearing protection first, with an NRR 25 dB rating, over-ear cups, and an integrated microphone so you can take calls without pulling anything off your head.
• inf protear E6850 — biggest trade-off: At 250 g and 8 x 6 x 4 inches, it is a bulky over-ear headset, not something you will casually toss in a pocket.
• Monster Open Ear AC600 — biggest strength: It weighs only 0.2 oz, clips onto your ear, and carries an IPX6 water-resistance rating, which is exactly what sweaty workouts demand.
• Monster Open Ear AC600 — biggest trade-off: It is not hearing protection. Open-ear design lets outside sound in by intent, and the 21-hour total playtime depends on carrying the charging case.
• Who the inf protear E6850 is for: Anyone running loud equipment — mowers, circular saws, tractors — who wants music and phone calls inside their ear protection.
• Who the Monster Open Ear AC600 is for: Runners, cyclists, gym-goers, and commuters who want light, breathable earbuds with clear call quality and zero pressure on the ear canal.
The inf protear E6850 is a Bluetooth hearing protection headset with an NRR 25 dB rating and sound isolation as its noise-control method. That combination tells you the whole story. This is a device built for environments where noise itself is the hazard — mowing, circular saw work, woodworking, tractor driving, construction, landscaping, snow blowing, and workshops are all named use cases in the specs. You put it on, and the ear cups physically block noise rather than digitally cancel it. The high-fidelity speakers and integrated microphone then let you stream audio and answer calls without moving the headset off your ears.
Comfort is a real consideration here. It weighs 250 g, which is substantial, but the design accounts for it: very soft ear cups that the specs say work even with glasses, a low-profile shape, a flexible headband, and cutouts meant to improve comfort when worn with a hat. The adjustable one-size headband fits adults. In my opinion, this is the right pick for someone who wears hearing protection for hours at a time and wants entertainment or call access baked in rather than layered on top. Who should skip it? Anyone who wants earbuds for the gym, anyone who needs something pocketable, and anyone who is not actually exposed to loud machinery. It is over-ear, yellow, ABS plastic, and unapologetically a work tool.
Monster Open Ear AC600: Who It's For
The Monster Open Ear AC600 is a clip-on open-ear earbud built for movement. The headline number is weight: 0.2 oz per bud. That is dramatically lighter than any over-ear option, and the specs lean into it — breathable, comfortable for extended wear, and made from a non-deforming hard-shell material designed to hold its shape over time so the fit stays secure. If you have ever had earbuds loosen mid-run, that detail matters more than it sounds.
Audio and calls are handled by a 40 mm dynamic driver and environmental noise cancellation (ENC). ENC here is about the microphone side, not about blocking sound for you — it monitors ambient noise and produces an opposing signal so your voice comes through clearly on calls. That is a meaningful distinction. Because the design is open-ear, you still hear traffic, gym announcements, and people around you, which is precisely why open-ear buds appeal to runners and cyclists. The IPX6 rating backs that up: sweat and rain spray are not a problem, and the specs frame it for running, cycling, mountaineering, and general fitness.
Side-by-Side: Which Should You Choose?
• Best for hearing protection → inf protear E6850. NRR 25 dB with sound isolation is the entire point of this product. The AC600 offers no protective rating.
• Best for workout and sweaty use → Monster Open Ear AC600. IPX6 water resistance plus 0.2 oz per bud is built for running, cycling, and gym sessions.
• Best for maximum playtime → inf protear E6850. 48+ hours in Bluetooth and 120+ hours in AUX mode versus 7 hours per charge and 21 hours with the case.
• Best for all-day comfort with glasses or a hat → inf protear E6850. Soft ear cups, flexible headband, and hat cutouts are specifically designed for this.
• Best for staying aware of your surroundings → Monster Open Ear AC600. Open-ear design deliberately lets outside sound in, which is safer on roads and in shared gyms.
• Best for clear voice calls in noisy places → Monster Open Ear AC600. ENC actively targets background noise on the microphone side.
• Best for long-range wireless freedom → inf protear E6850. The stated Bluetooth range up to 300 m far exceeds the AC600's 33 feet.
• Best for portability → Monster Open Ear AC600. A charging case with clip-on buds beats a 250 g over-ear headset for pocket and bag carry.
I would buy the inf protear E6850, and here is my reasoning: if you are shopping in this category at all, the loud-environment use case is the one where a wrong choice actually costs you something — your hearing. NRR 25 dB, 120+ hours of AUX playtime, an integrated mic, and comfort designed around glasses and hats make it the more capable tool for mowing, sawing, and workshop days. The Monster Open Ear AC600 is genuinely excellent at what it does, and I would recommend it without hesitation to a runner or cyclist. But between these two, the E6850 solves the harder problem.
Yes. The E6850 carries an NRR 25 dB rating and uses sound isolation, which is what you need around a mower or saw. The AC600 is open-ear by design and does not block machinery noise, so it is not hearing protection.
The specs say yes — 0.2 oz per bud, a non-deforming hard-shell clip design, and IPX6 water resistance are all aimed at keeping the fit secure through sweat and movement.
The inf protear E6850, by a wide margin: 48+ hours in Bluetooth mode and 120+ hours in AUX mode. The Monster Open Ear AC600 gives about 7 hours per charge and 21 hours total with its charging case.
Yes, but differently. The inf protear E6850 has an integrated microphone so you can answer without removing the headset. The Monster Open Ear AC600 uses ENC to reduce background noise on your voice, which tends to help in busy environments. For current pricing on either, check the button on this page.
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