If you want open-ear listening with onboard music for swimming, choose Roujune Bone Conduction Headphones; if you need compact semi-in-ear earbuds for everyday calls and listening, choose Defunc True LITE II. For kids, the deciding question is whether open-ear wear and swim-friendly MP3 playback matter more than a familiar earbud style and longer stated total playtime.
• Roujune’s biggest strength: open-ear bone-conduction design, IPX8 water resistance, and 32GB of built-in memory for music playback without a Bluetooth connection. Its trade-off is that underwater listening requires MP3 mode and music stored on the headphones.
• Defunc’s biggest strength: semi-in-ear earbuds with a 13mm driver, ENC call features, low-latency support, and up to 20 hours of total playtime. Its trade-off is IPX4 water resistance, so it is not the swimming-focused option.
• Roujune is for: kids who may benefit from an open-ear design, or who want headphones intended for swimming and stored music.
• Defunc is for: kids who prefer small, conventional earbuds for everyday listening, calls, and compatible app features.
Roujune is the more specialized choice. Its open-ear bone-conduction design does not sit as a conventional earbud inside the ear. That may be appealing for a child who dislikes the feel of in-ear earbuds for kids, or for a parent looking for a different fit style. The headphones have a silicone and titanium construction and a secure-fit design, according to the product information. Those details point toward a wearable format intended to stay in place, though fit is still personal and the sheet does not specify sizing.
The standout use case is swimming. Roujune is listed as IPX8 waterproof and includes 32GB of internal memory, plus an MP3 mode. That combination matters because Bluetooth signals do not transmit underwater: music for a swim needs to be stored on the headphones and played in MP3 mode. The listed supported file formats include MP3, WMA, FLAC, APE, and WAV. For a kid who swims and wants audio without carrying a phone, onboard storage is a practical distinction from ordinary Bluetooth earbuds.
The stated battery life is eight hours, and the product information lists Bluetooth 5.4 as a key feature. There is a version discrepancy in the supplied details: another product-information field says Bluetooth version 6. I would not treat the exact Bluetooth version as a deciding point here. The clearer difference is the intended listening setup: open-ear wear, water resistance for swimming, and the option to play stored files. Who should skip it: skip Roujune if the priority is a small semi-in-ear bud for everyday calls, or if the child wants to stream audio over Bluetooth while underwater.
How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-18 · 8 min read · Independent comparison
Defunc True LITE II is the simpler match for everyday listening. It uses a semi-in-ear fit, so it is closer to the conventional bud style than Roujune’s open-ear bone-conduction design. The listed driver is 13mm, and the product description positions it for music, podcasts, movies, and calls. That makes it a plausible option for a child who wants one pair for varied daily listening rather than a swimming-specific headset.
Its feature set is aimed at common wireless-earbud tasks. Bluetooth 6.0, touch controls, ENC clear-call support, and low-latency performance are listed. In practical terms, those features speak to pairing, managing playback by touch, handling calls, and watching video with less delay between picture and sound. The sheet also lists AI app compatibility, but does not explain the app’s specific functions, so I would not assume particular parental controls or sound settings.
Defunc lists up to 20 hours of total playtime and IPX4 water resistance. The battery figure is longer than Roujune’s stated eight hours, but it is described as total playtime, not as a single uninterrupted listening session. IPX4 makes this the more everyday-splash-oriented option of the two, not the one to choose for swimming. For families shopping for a bluetooth headset gift for kids, its familiar earbud format and call-related features may be easier to match to everyday use. Who should skip it: skip Defunc if the main need is headphones for swimming or a genuinely open-ear listening design.
The sheet identifies the listed model as blue and gives a carrying case weight of 35g, with compact case measurements. Those details support a portable setup, although the right fit for a child cannot be guaranteed from the listed information alone. A semi-in-ear shape may suit some ears better than an in-ear seal, but fit preferences vary; it is worth considering whether the child is comfortable wearing this style.
• Best for swimming and stored music → Roujune Bone Conduction Headphones. It is listed as IPX8 waterproof and has 32GB of memory with MP3 mode. Load compatible audio before a swim; Bluetooth streaming will not work underwater.
• Best for everyday wireless listening → Defunc True LITE II. Its semi-in-ear design, Bluetooth 6.0, and touch controls suit routine listening without Roujune’s swim-specific MP3 setup.
• Best for an open-ear design → Roujune Bone Conduction Headphones. Its bone-conduction format leaves the ear open rather than using a conventional bud in the ear.
• Best for stated total playtime → Defunc True LITE II. It lists up to 20 hours of total playtime, compared with Roujune’s stated eight hours of battery life. The figures use different wording, so they are not necessarily a like-for-like measure of one continuous session.
• Best for calls and video features → Defunc True LITE II. ENC clear-call support and low-latency performance are specifically listed, making it the more clearly call- and video-oriented choice on paper.
• Best for avoiding a conventional earbud fit → Roujune Bone Conduction Headphones. Its open-ear design is the more relevant pick for a child who dislikes earbuds sitting in the ear.
• Best for a child who wants familiar, compact earbuds → Defunc True LITE II. Its semi-in-ear buds and small carrying case are aimed at portable everyday use.
• Best for choosing between water use and daily convenience → Roujune for swimming; Defunc for ordinary listening. Their water-resistance ratings point to different use cases, not interchangeable protection.
Buying Considerations
Next, be precise about water use. Roujune is the swimming-oriented option, but swimming requires preparation: store audio on its 32GB memory and switch to MP3 mode before entering the water. The product instructions say it starts in Bluetooth mode and that a double press of the power button switches between Bluetooth and MP3 modes. Defunc is listed as IPX4 water resistant, which is not the same swimming use case. I would not choose it for underwater listening.
Consider what the child will listen to. Roujune’s stored-file approach is useful when a phone connection is unavailable or unsuitable, but it means preparing compatible files on the headphones. Defunc is positioned for everyday wireless use and adds touch controls, ENC call features, low latency, and AI app compatibility. The available information does not spell out the app’s exact options, so families should not assume it includes specific monitoring or parental features.
Battery claims also need context. Roujune lists eight hours; Defunc lists up to 20 hours of total playtime. That makes Defunc the stronger stated option for longer use between charging sessions, but the descriptions do not provide a shared testing method or a per-charge breakdown. If the child’s routine involves short listening periods, that difference may matter less than fit, swimming needs, or whether stored music is useful.
Finally, decide whether calls are important. Defunc explicitly lists ENC clear-call support, while the supplied Roujune details focus on open-ear listening and MP3 playback for swimming. If calls are central to the purchase, Defunc has the clearer feature match. If swimming or avoiding an in-ear bud is the priority, Roujune has the more distinctive case.
I would choose Roujune Bone Conduction Headphones for a child whose main use case is swimming or who prefers an open-ear design. The combination of IPX8 water resistance and 32GB of stored music gives it a purpose the Defunc earbuds do not share. For kids, that swim-ready, phone-free listening option is the deciding advantage in my opinion. I’d choose Defunc instead for everyday calls, video, and longer stated total playtime.
FAQ
They support Bluetooth, but the design is described as open-ear bone conduction rather than conventional in-ear buds. They also include MP3 playback from internal storage, which is the mode to use for underwater listening.
The listed rating is IPX4 water resistance, while the product is described for everyday use. The supplied details do not position it as a swimming headphone, so Roujune is the more appropriate choice for that use.
Defunc lists up to 20 hours of total playtime, while Roujune lists eight hours of battery life. Since the figures are described differently, they do not establish an exact like-for-like listening comparison.
• MillSO USB vs REHOC 3.5mm: Headphones for Windows PC
• E-filliate DEWALT Heavy Duty vs JBL Vibe Flex True
As an Amazon Associate I earn from qualifying purchases.
We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon and affiliated sites.
When you buy through links on this page, we may earn a commission from qualifying purchases at no extra cost to you.
Amazon and the Amazon logo are trademarks of Amazon or its affiliates. This site is an independent third-party review and is not affiliated with, endorsed by, or sponsored by Amazon or the product brands mentioned.