If you want a dedicated, waterproof device for underwater swimming with onboard music storage, choose Pmjebe Bone Conduction Swimming; if you need all-day battery life and superior connectivity for land-based sports and daily library sessions, choose Boytond Open Ear Earbuds.
• Pmjebe Bone Conduction Swimming: Its biggest strength is true IPX8 waterproofing with built-in 8GB storage for underwater use without a phone; its trade-off is that Bluetooth does not work while submerged.
• Boytond Open Ear Earbuds: Its biggest strength is an impressive 50-hour total playback time and Bluetooth 5.3 stability for long outdoor runs or library study sessions; its trade-off is it lacks the deep-water submersion rating required for serious lap swimming.
• Who each pick is for: Choose Pmjebe if your primary goal is swimming laps without carrying a phone; choose Boytond if you need lightweight bone conduction headphones for library use, running, or commuting where battery endurance matters most.
The Pmjebe S3 is engineered for one specific environment: water. It is not merely "water-resistant" in the general sense; it carries an IPX8 professional depth waterproof rating, which means it can handle complete submersion. This makes it the only logical choice for swimmers who refuse to compromise on their audio experience while doing laps. The design relies on bone conduction technology, transmitting sound through the cheekbones directly to the cochlea. This open-back approach allows you to hear your surroundings even while wearing a swimming cap and goggles, though the manufacturer notes that using earplugs can improve sound clarity if the pool environment becomes too noisy.
What sets this device apart from standard wireless earbuds is its independence. It features a built-in MP3 player with 8GB of internal memory. You can drag and drop songs from a PC or Mac in formats like FLAC, WAV, WMA, and MP3. Once loaded, you have roughly 2000 songs stored locally. Since Bluetooth signals are isolated by water, the device switches automatically to this built-in mode when you dive in. This eliminates the need to carry a smartphone into the pool, reducing bulk and potential points of failure.
However, this specialization comes with clear limitations. If your routine involves cycling, running, or walking in a busy city, the Pmjebe is less convenient because you must manage the physical buttons for track skipping and shuffle modes rather than relying on touch controls or voice commands. Furthermore, while it works beautifully underwater, the lack of Bluetooth connectivity while submerged means you cannot stream music from your phone while in the water. It is strictly a standalone player. If you are looking for sports earbuds for library use or general gym workouts where you might want to take calls or switch between apps instantly, this device requires more manual interaction. It is best suited for the swimmer who values durability and autonomy over seamless smartphone integration.
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-11-01 · 6 min read · Independent comparison
The Boytond Ultra Open Ear Earbuds are designed for the active lifestyle that stays primarily on land. These clip-on earbuds utilize an ergonomic, hook-style design that rests gently over the ears without sealing the canal. This creates a ventilated environment that reduces sweat buildup, a critical feature for anyone engaging in high-intensity cardio or hot yoga. Because they do not block the ear canal, they allow for immediate environmental awareness, making them ideal for runners navigating traffic or cyclists sharing the road.
Battery life is the standout feature here. With a single charge, you get up to 10 hours of continuous playback. The inclusion of a charging case extends this to a massive 50 hours total. For someone who needs bluetooth headphones for library use or long commutes, this eliminates the anxiety of running out of power mid-session. The fast-charging capability is equally impressive; just five minutes of charging provides an hour of playback. This is perfect for the user who forgets to charge overnight but knows they will grab a quick charge before heading out. The device also utilizes Bluetooth 5.3, offering stable connections within a 33-foot range and low latency, ensuring that your audio syncs perfectly with video or live broadcasts during a workout.
While these earbuds are marketed as waterproof, the focus is clearly on sweat resistance and rain protection rather than full submersion. They are not designed for diving or competitive swimming. The touch controls allow for easy management of calls and tracks, offering a level of convenience that the button-heavy Pmjebe cannot match. The design prioritizes comfort for long durations, with flexible joints and breathable grips that prevent fatigue. If you are looking for lightweight bone conduction headphones for library use, where silence and comfort are paramount, the Boytond offers a secure fit that won't slip during movement. However, they lack the onboard storage of the Pmjebe, meaning you must always have your phone nearby to play music. They are the ultimate companion for the athlete who moves from the gym to the street to the office without wanting to swap devices.
• Best for underwater swimming → Pmjebe Bone Conduction Swimming: Only this model has the IPX8 rating and onboard storage to function independently in the water.
• Best for battery life → Boytond Open Ear Earbuds: The 50-hour total capacity with a charging case dwarfs the Pmjebe's 8-hour limit.
• Best for library use → Boytond Open Ear Earbuds: Their lightweight, open-ear design and silent operation make them superior for quiet study environments.
• Best for connectivity → Boytond Open Ear Earbuds: Bluetooth 5.3 ensures a stable link to your phone, whereas the Pmjebe disconnects from phones underwater.
• Best for storage freedom → Pmjebe Bone Conduction Swimming: With 8GB built-in, you can leave your phone behind entirely during swims.
• Best for call quality → Boytond Open Ear Earbuds: The advanced drivers and microphone setup are optimized for face-to-face communication clarity.
• Best for comfort during long runs → Boytond Open Ear Earbuds: The ventilated, hook-style design prevents sweat accumulation better than the solid headband style of the Pmjebe.
• Best for ease of operation → Boytond Open Ear Earbuds: Touch controls offer faster access than the tactile buttons required by the Pmjebe.
In my opinion, if I were setting up a gear bag for a mixed routine of swimming, running, and studying, I would buy the Boytond Open Ear Earbuds as my primary daily driver. The sheer versatility of the 50-hour battery life and the Bluetooth 5.3 stability makes it indispensable for modern life, especially for those needing lightweight bone conduction headphones for library sessions or long commutes. While the Pmjebe is an incredible piece of engineering for the pool, it is too specialized for general use. I would only recommend the Pmjebe if swimming is your absolute priority and you refuse to carry a phone into the water. For everyone else, the Boytond offers the perfect balance of performance, comfort, and endurance.
Yes, the Pmjebe has 8GB of built-in storage, allowing you to download music via USB and swim without a phone since Bluetooth does not work underwater.
Yes, the Boytond Open Ear Earbuds feature Bluetooth 5.3 technology, providing a stable connection up to 33 feet with low latency.
Yes, their open-ear design keeps you aware of your surroundings while delivering clear sound, making them ideal for sports earbuds for library settings where you don't want to block out ambient noise completely.
The Pmjebe offers about 8 hours of playback, whereas the Boytond delivers up to 10 hours on a single charge and 50 hours total with its charging case.
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