We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-29 · 6 min read · Independent comparison
If you want a true-wireless stereo pair built for long workouts and all-day ambient awareness, choose ABCDONG Open Ear Headphones; if you need a single-ear headset for calls, driving and hands-free work, choose Sunffice Open Ear Headphone.
• ABCDONG's biggest strength: a stereo pair of true-wireless earbuds with 16.2mm dynamic drivers, Bluetooth 5.3, a 33-foot range and IPX6 water resistance — one of the more capable open-ear setups in this price-adjacent class of sport buds.
• ABCDONG's biggest trade-off: it's a two-earbud product with a charging case, so there's more to carry and more to keep track of than a single hook-on earpiece.
• Sunffice's biggest strength: a 9g single bone-conduction earpiece with a rotatable earhook, ENC mic and a huge standby/continuous-talk window — ideal for calls, driving and all-day wear on one ear.
• Sunffice's biggest trade-off: it's mono by design (one earpiece in the box), uses older Bluetooth 5.2, and its shorter 15-meter range is fine for phone-in-pocket use but not room-to-room roaming.
• Pick ABCDONG if you want music-first stereo sound, low-frequency output and a sport-ready water rating.
• Pick Sunffice if you want a lightweight, always-on call/voice-assistant companion for driving and business.
The ABCDONG Open Ear Headphones are the music-and-movement option. The spec sheet points to a proper stereo pair: true-wireless earbuds with a 16.2mm dynamic driver, a 20Hz–20,000Hz frequency range and 16-ohm impedance. That driver size and frequency spread are the tell — this is a set designed to actually deliver bass, which is the usual weak spot of open-ear designs. If you care about low-end punch while you run, this is the more convincing pick on paper.
Connectivity and durability are the other two pillars. Bluetooth 5.3 is the newer of the two versions here, and the 33-foot range means you can leave your phone on a bench or in a bag and still roam a gym floor or a trailhead without dropouts. IPX6 is the higher water rating of the two products, so sweat, splashes and light rain are not a concern. The wrap-around earhook keeps each bud seated during training, and the silicone construction plus bud-free design is aimed squarely at people who hate the pressure and heat of in-ear tips.
Sunffice Open Ear Headphone: Who It's For
The Sunffice Open Ear Headphone goes the other direction entirely — it's a single-ear, bone-conduction earpiece built around calls and all-day wear. At just 9g with a rotatable earhook, it's designed to sit on either ear and basically disappear. That's the whole pitch: you put it on in the morning and forget it's there. For drivers, delivery workers, office staff and anyone who lives on the phone, that's a genuinely useful form factor.
The call side is where the specs get interesting. The integrated ENC microphone filters background noise so you can talk in loud environments, and the multi-function button handles play/pause, answer/reject and voice-assistant activation without touching your phone. The battery numbers are the standout: up to 720 hours of standby, up to 48 hours of continuous talk time and 26 hours of listening, from a 1.5-hour charge. If you're the kind of person who forgets to plug things in, that standby figure is the safety net. The iOS battery-level display is a nice touch for iPhone users.
Two things to weigh honestly. First, this is mono — one earpiece in the box, so it's a calls-and-podcasts tool, not a stereo music experience. Second, the bone-conduction driver and Bluetooth 5.2 with a 15-meter range are a step behind on paper. The IPX5 rating handles sweat and rain but is a notch below IPX6. The Chinese/English voice-prompt toggle is a small detail, but a thoughtful one if you prefer your prompts in a specific language.
Who should buy it: drivers, business users, remote workers and anyone who wants hands-free calling with a long standby window. Who should skip it: if you want two-earbud stereo sound for music, this isn't the tool.
Side-by-Side: Which Should You Choose?
• Best for calls and voice work → Sunffice Open Ear Headphone. The ENC mic and 48-hour talk-time ceiling are built for people on the phone all day.
• Best for battery endurance → Sunffice Open Ear Headphone. 720 hours standby and 48 hours talk time beat the ABCDONG's 30-hour average life.
• Best for water and sweat resistance → ABCDONG Open Ear Headphones. IPX6 is the higher rating of the two for training and wet weather.
• Best for connectivity and range → ABCDONG Open Ear Headphones. Bluetooth 5.3 and 33 feet versus Bluetooth 5.2 and 15 meters.
• Best for lightest, most minimal wear → Sunffice Open Ear Headphone. 9g on a single rotatable earhook is about as unobtrusive as it gets.
• Best for left/right flexibility → Sunffice Open Ear Headphone. The rotatable hook works on either ear; ABCDONG's design is a fixed pair.
• Best for a charging case and travel kit → ABCDONG Open Ear Headphones. The wireless charging case plus cable makes it a self-contained package.
In my opinion, the ABCDONG Open Ear Headphones are the better all-round buy for most people, because they give you stereo sound, newer Bluetooth, a longer range and a higher water rating in one package — that covers music, training and commuting at the same time. I'd only steer you to the Sunffice Open Ear Headphone if your day is dominated by calls and driving, where its 9g single-ear design, ENC mic and enormous standby window are the more sensible fit. If you want one device that does a bit of everything well, go ABCDONG. If you want a dedicated call companion, go Sunffice.
FAQ
No. It's a single-ear bone-conduction earpiece, and only one is included. It's built for calls, driving and voice assistants rather than stereo listening.
ABCDONG lists around 30 hours of average battery life with a 2-hour charge. Sunffice lists up to 26 hours of listening, up to 48 hours of talk time and up to 720 hours of standby from a 1.5-hour charge.
Both are budget-friendly open-ear options, so the deciding factor is really your use case rather than the number. Check the current price on Amazon for each before you commit — the button on this page will take you there.
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