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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-18 · 6 min read · Independent comparison
• Raycon Fitness Open Ear — biggest strength: a true open-ear hook design with rotating ear hooks on two axes, so nothing seals your ear canal and you stay fully aware of what's around you during runs and workouts.
• Raycon Fitness Open Ear — biggest trade-off: no active noise cancelling and no passive isolation either, so loud environments compete directly with your audio; the buds themselves run about 8 hours per charge, with the rest coming from the case.
• TREBLAB X4 — biggest strength: a 2500mAh charging case that TREBLAB says adds 22 full recharges (253 hours total playtime) and can top up your phone on the go, plus a 60ms low-latency gaming mode and Bluetooth 5.4.
• TREBLAB X4 — biggest trade-off: these are in-ear buds with passive noise isolation, so you lose the ambient awareness that makes open-ear designs appealing; the case is a bulky 3.87 inches tall and 3.84 ounces on its own.
• Who Raycon Fitness Open Ear is for: runners, cyclists and gym-goers who prioritize safety and open-ear comfort over isolation.
• Who TREBLAB X4 is for: all-day and travel users who want huge battery reserves, a backup phone charger and a gaming-friendly mode.
The Raycon Fitness Open Ear is built around one idea: keep your ears open. The earpiece shape is open-ear with a behind-the-ear hook, and the hooks rotate on two axes so you can dial in a fit that stays put through running, lifting or stretching. Because nothing plugs your canal, you hear cars, bikes, announcements and training partners without pulling a bud out. For outdoor runners and anyone training in a busy gym, that's the whole point.
The spec sheet backs up the workout focus. Sweat-resistant construction, a lightweight build, Bluetooth 5.2 with a 10-meter range, and a dynamic driver covering 20Hz–20kHz. The battery story is 8 hours of nonstop playback per charge, plus 32 more from the case for a 40-hour total — enough for a week of short sessions, though a full charge takes 8 hours, which is slow. Multipoint connection is a genuinely useful touch: start on your workout playlist, then jump to a work call without repairing.
Where it falls short: there's no noise control of any kind, so a noisy cardio floor will fight your music, and open-ear designs inherently leak sound and deliver less bass impact than sealed buds. Controls are voice-based with media control support, which is fine but not as tactile as physical buttons. Skip it if you want deep isolation on a plane or train, or if you need marathon-length single-charge battery.
The TREBLAB X4 goes the opposite direction. These are in-ear buds with ear hooks, so you get passive noise isolation — the seal itself blocks a chunk of outside sound. The hook keeps each bud locked in without the pressure that makes long sessions uncomfortable, and at roughly 0.02 lb per bud TREBLAB says you'll forget they're in. The 10mm dynamic driver, 105dB sensitivity and 32-ohm impedance suggest an easy-to-drive, full-sounding tuning across the same 20Hz–20kHz range.
The headline feature is endurance. TREBLAB rates 11 hours per charge and a 2500mAh case that adds 22 more full charges, for 253 hours total. The case is also a power bank — it can charge your phone when you're out all day, which is a real convenience on trips and long weekends. Charging is quick at about 2.5 hours for both the buds and the case. You also get Bluetooth 5.4, a 60ms low-latency gaming mode, ENC dual-mic noise cancelling for calls, IPX5 water resistance and three physical buttons per earbud.
The trade-offs are honest ones. Passive isolation means you're sealed off from your surroundings — the opposite of the open-ear philosophy — so cyclists and road runners should think twice. The case is big and heavy for a pocket, and the total package weighs 4.16 ounces. Skip it if situational awareness is your top priority; buy it if battery life, call clarity and gaming latency matter most.
Side-by-Side: Which Should You Choose?
• Best for total battery life → TREBLAB X4. 253 hours total versus 40 hours, plus a case that recharges your phone.
• Best for travel and power outages → TREBLAB X4. The 2500mAh case doubles as a power bank for your phone.
• Best for outdoor running and cycling → Raycon Fitness Open Ear. Sweat-resistant, lightweight and open, so you hear what's coming.
• Best for calls in noisy places → TREBLAB X4. ENC dual-mic noise cancelling plus passive isolation filters street and gym noise.
• Best for mobile gaming → TREBLAB X4. The 60ms gaming mode and Bluetooth 5.4 target low-latency play; Raycon doesn't list a gaming mode.
• Best for quick top-ups → TREBLAB X4. 2.5-hour charge time versus 8 hours for the Raycon.
• Best for gym and workout comfort → Raycon Fitness Open Ear. Two-axis rotating hooks and an open fit avoid the pressure of sealed in-ears.
If I had to pick one, I'd buy the TREBLAB X4. In my opinion it wins on the things most people actually feel day to day: 11 hours per charge instead of 8, a case that keeps going for weeks and can rescue your phone, faster charging, Bluetooth 5.4, ENC call clarity and a gaming mode. The Raycon Fitness Open Ear is the better choice only if open-ear awareness is non-negotiable for you — for road running or cycling, that's a legitimate reason to pick it. Otherwise, the X4 gives you more headphone for more situations.
Check the current price on Amazon for both before deciding, since that's the one variable that can flip this call.
Raycon Fitness Open Ear. Its open-ear design leaves your canal unblocked, so you hear cars and other people — a safety advantage for road running and cycling. The TREBLAB X4 seals your ears with passive isolation, which sounds fuller but cuts you off.
TREBLAB X4 by a wide margin. It's rated 11 hours per charge with a 2500mAh case adding 22 more charges, for 253 hours total. Raycon Fitness Open Ear is 8 hours per charge plus 32 from the case, for 40 hours total.
Yes. The 2500mAh case is designed as a power bank, so it can top up a phone on the go in addition to recharging the buds. That's a feature the Raycon Fitness Open Ear case doesn't offer.
TREBLAB X4. It has ENC dual-mic noise cancelling for clearer calls and a 60ms low-latency gaming mode on Bluetooth 5.4. Raycon Fitness Open Ear uses DSP for voice clarity but doesn't list a gaming mode.
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