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
If you want serious, certified noise reduction for loud environments like shooting, mowing or construction, choose SULWZM Hearing Protection Ear; if you need wireless music and call audio for workouts and daily listening, choose Rulefiss Earbuds. These two products share almost nothing except the word "ear" — one is a passive-safety over-ear muff, the other is a Bluetooth sport earbud with earhooks. Let me break down what each one actually is, and who it's really built for.
• SULWZM Hearing Protection Ear — biggest strength: Certified hearing protection with an NRR 28 dB / SNR 34 dB rating, built to quiet genuinely loud environments rather than play audio.
• SULWZM Hearing Protection Ear — biggest trade-off: It's a passive sound-isolation muff, so there's no Bluetooth, no music, no calls, and no charging case involved.
• Rulefiss Earbuds — biggest strength: A feature-packed Bluetooth 5.3 sport headset with 13mm drivers, 48 hours of total battery, IP7 waterproofing and a low-latency mode.
• Rulefiss Earbuds — biggest trade-off: The noise control here is active noise cancellation aimed at everyday listening, not a certified NRR safety rating for firearms or machinery.
• Who SULWZM is for: Shooters, landscapers, construction workers, and anyone who needs to protect their ears in sustained loud noise.
• Who Rulefiss is for: Runners, gym-goers, commuters and anyone who wants wireless audio with a secure earhook fit.
The SULWZM Hearing Protection Ear is, first and last, a safety product. It's built around a certified NRR 28 dB rating (and a 34 dB SNR rating), tested to ANSI S3.19 and CE EN 352-1. Those are the numbers that matter here. In plain terms, this is an over-ear muff designed to drop the volume of the world around you — not to play anything back to you. If you've ever fired a rifle without protection, mowed a lawn for two hours, or stood next to a running compactor, you know exactly the kind of environment this is made for. It also comes up in airports and on construction sites, where the goal is simply to create a quieter pocket to rest or concentrate.
The build leans practical. It's made from ABS plastic with a foldable design, so it collapses down and travels without eating up space in a bag or range case. The padding has been updated to reduce clamping pressure, which matters because a muff you actually keep on your head for a full shift is worth far more than one you rip off after twenty minutes. It's sized for adults and finished in red, with a straightforward solid pattern.
So who should buy it? Anyone whose priority is protecting their hearing in a genuinely loud, sustained-noise situation — shooting, mowing, operating equipment, working a job site. Who should skip it? If you want music, phone calls, or a wireless connection to your phone, this is the wrong tool entirely. It has no audio features and no Bluetooth. It isolates sound; that's the whole job, and it does it by design.
The Rulefiss Earbuds (model Q38) are the opposite kind of product: an audio device built for movement. The headline is Bluetooth 5.3, which the specs say connects quickly and stably within about 15 meters, with lower latency and lower power draw, and supports HSP, HFP, A2DP and AVRCP. After the first pairing, the buds auto-connect when you lift them out of the case — a small thing that becomes a big deal when you're heading out the door for a run.
The sound side is more serious than the sport-bud label suggests. There's a 13mm graphene moving-coil driver with AAC/SBC decoding, and the spec sheet claims a 45% wider frequency bandwidth, with a 20Hz–20kHz range. Two microphones with CVC 8.0 noise reduction are on board for calls, which the specs say retain roughly 85% of the sound. In practice, that's the difference between a call your friend can actually follow and one they keep asking you to repeat.
Battery life is where it stands out. The specs put single-charge playtime at 6–8 hours, stretched to 48 hours total with the 800mAh charging case, which charges over USB-C in about 1.5 hours. The case has a dual LED display showing charge from 1% to 100%, so you're never guessing. The fit is the other big design choice: a soft, flexible 45° earhook, each bud around 7g, with three sizes of silicone tips (S/M/L). IP7 waterproofing covers sweat and rain. Controls are touch-based on each bud — play, pause, volume, calls, and voice assistant activation — and they're compatible with iOS 9.0 and Android 5.0 or later.
Who should buy it? Runners, gym users, commuters, and anyone who wants wireless audio that stays put and survives sweat. Who should skip it? Anyone who needs certified hearing protection for firearms or heavy machinery. This is not a safety device, and it isn't rated like one.
Side-by-Side: Which Should You Choose?
• Best for listening to music → Rulefiss Earbuds. Bluetooth 5.3 and 13mm drivers are the whole point; SULWZM has no audio at all.
• Best for battery life → Rulefiss Earbuds. Up to 48 hours total with the charging case, versus a passive muff that needs no power whatsoever.
• Best for workouts and sweat → Rulefiss Earbuds. IP7 waterproofing and a 7g-per-bud earhook fit are built for running and the gym.
• Best for shooting, mowing or construction → SULWZM Hearing Protection Ear. That's its exact stated use case, and the certified rating backs it up.
• Best for travel and storage → SULWZM Hearing Protection Ear. The foldable ABS design collapses flat; Rulefiss relies on a charging case.
• Best for calls → Rulefiss Earbuds. Dual mics with CVC 8.0 are designed to keep your voice clear; SULWZM has no microphone.
• Best for long stationary shifts → SULWZM Hearing Protection Ear. Updated soft padding is aimed at reducing clamping pressure over hours of wear.
In my opinion, these aren't really competitors — they're two different jobs wearing similar-sounding names. If your goal is to protect your hearing from loud, sustained noise, I'd buy the SULWZM Hearing Protection Ear. The certified NRR 28 dB rating, the foldable ABS build and the low-pressure padding are exactly what that job needs. If your goal is wireless audio for running, the gym or the commute, I'd buy the Rulefiss Earbuds for the Bluetooth 5.3 connection, 48-hour battery and IP7 sweat resistance. Pick by the task, not by the label.
That depends on the specific Bose model, since charging times vary by generation and battery size. The Rulefiss Earbuds here specify a 1.5-hour charge time for their 800mAh case over USB-C, which is a useful reference point for a modern wireless audio device. Always check your own model's manual, as no single number applies across brands.
Sony's over-ear models have their own charging specs that differ from model to model, so there's no universal figure. For comparison, the Rulefiss Earbuds list a 1.5-hour USB-C charge for the case, while the SULWZM Hearing Protection Ear has no battery at all and never needs charging. Match the number to your exact model rather than assuming.
Again, this varies by JBL model and battery capacity. The useful takeaway from these two products is that a wireless device carries a charging routine — the Rulefiss Earbuds need about 1.5 hours for the case — while a passive muff like the SULWZM needs zero power. If charging time is a dealbreaker, factor that into which type you buy.
There's no fixed lifespan, but it comes down to materials and how you treat them. The SULWZM is built from ABS plastic with a foldable frame, and the Rulefiss uses silicone earhooks with IP7 waterproofing to resist sweat and rain damage. Both designs are aimed at durability; proper storage and cleaning are what actually extend the life of either.
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