If you want reliable audio for swimming and open-ear awareness during outdoor calls, choose Rhyfell Bone Conduction Swimming; if you need deep bass, extended battery life for long commutes, and superior call clarity in noisy environments, choose WUYI Earbuds.
• Rhyfell Bone Conduction Swimming: Delivers true underwater immersion with IP68 waterproofing and dual drivers, but lacks active noise cancellation and has a shorter single-charge runtime of 8 hours. Best for swimmers and runners who must hear their surroundings.
• WUYI Earbuds: Offers massive 128-hour total playtime, IPX7 sweat resistance, and high-definition call technology with ENC noise reduction, though it requires an in-ear seal that blocks ambient sound. Best for athletes prioritizing bass and long-distance battery endurance.
The Rhyfell X39 is built for a very specific type of user: someone who needs to hear the world around them while listening to music or taking calls. Its defining feature is the hybrid air and bone conduction audio system. By combining two distinct driver types, this headphone aims to provide deeper bass and clearer vocals than traditional bone conduction units, all while keeping your ear canal completely open. This design choice is not just about comfort; it is a safety feature. If you are running near traffic, cycling on busy streets, or working out in a gym where you need to hear instructions, this open-ear design ensures you never miss a crucial sound from your environment.
For the serious swimmer, this device is a game-changer. The IP68 waterproof rating means it can withstand full submersion, unlike standard water-resistant gear. With 32GB of built-in storage, you can carry over 8,000 songs directly on the device. This allows you to leave your phone behind and swim without relying on Bluetooth signals, which do not travel well through water. You simply download your playlist beforehand, switch to MP3 mode, and dive in. The memory titanium band provides a flexible, secure fit that stays put even during vigorous strokes or HIIT sessions, weighing in at a featherlight 25.5 grams so you barely feel it.
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-24 · 6 min read · Independent comparison
However, this product is not for everyone. If your primary goal is to isolate yourself from the world with heavy bass or to block out construction noise, this will not meet your expectations. It relies on vibration rather than sealing the ear, meaning background noise is always present. Additionally, the battery life tops out at 8 hours on a single charge. While sufficient for a day of training, it does not match the multi-day endurance of some competitors. If you are looking for the best voice assistant headphones for calls specifically in a quiet room, the open design might let too much ambient chatter bleed into your conversation compared to sealed alternatives. But for the runner, cyclist, or swimmer who values situational awareness above all else, this is a specialized tool designed to keep you safe and connected.
The WUYI Q53 earbuds cater to a different set of priorities, focusing heavily on battery longevity, sound isolation, and call clarity in chaotic environments. These wireless earbuds utilize a dynamic driver with a large 13.44mm composite titanium diaphragm, engineered to deliver rich bass and transparent mid-to-high frequencies. Unlike the open design of the Rhyfell, these sit inside the ear canal, providing passive noise cancellation that naturally dampens external sounds. This physical seal creates a more immersive listening experience, making them ideal for those who want to lose themselves in their music or podcasts without distraction.
Where the WUYI truly shines is its power management and call capabilities. The charging case holds a massive 2600mAh capacity, which extends the total playback time to an impressive 128 hours. This means you could theoretically go weeks without plugging the case into a wall, provided you use the earbuds for only a few hours a day. The case itself doubles as an emergency power bank, capable of recharging a smartphone by over 40% when needed—a feature that is incredibly practical for travelers or hikers. For calls, the device incorporates high-performance ENC (Environmental Noise Cancellation) technology. This actively reduces ambient noise, ensuring that your voice comes through crystal clear even if you are on a windy street or in a bustling café. This makes them a strong contender for anyone seeking the best open ear headphones for calls in terms of clarity, despite being an in-ear model.
The design also leans heavily into sports utility. The ergonomic curved hooks and three sizes of silicone tips ensure a secure fit for small ears and prevent the buds from falling out during intense movement. They are rated IPX7 waterproof, protecting against heavy sweat and rain, though they are not designed for full submersion like the Rhyfell. The Bluetooth 5.4 chip offers a stable connection up to 15 meters, reducing dropouts as you move between rooms. Smart touch controls allow you to manage tracks, volume, and voice assistants with simple taps. However, the trade-off is the in-ear seal; if you have sensitive ears or prefer to stay aware of your surroundings, the passive isolation might feel restrictive. These are best for users who prioritize deep audio quality and marathon battery life over situational awareness.
• Best for swimming and underwater audio → Rhyfell Bone Conduction Swimming (IP68 rated with 32GB internal storage).
• Best for total battery endurance → WUYI Earbuds (128 hours total playtime with a 2600mAh case).
• Best for call clarity in loud environments → WUYI Earbuds (ENC noise-canceling microphone technology).
• Best for situational awareness and safety → Rhyfell Bone Conduction Swimming (Open-ear design keeps ears uncovered).
• Best for deep bass and immersive music → WUYI Earbuds (13.44mm dynamic drivers with passive noise isolation).
• Best for long-distance signal stability → WUYI Earbuds (Bluetooth 5.4 with 15-meter range vs. 10 meters on Rhyfell).
• Best for emergency backup power → WUYI Earbuds (Case functions as a power bank for other devices).
• Best for lightweight, non-intrusive wear → Rhyfell Bone Conduction Swimming (25.5g weight vs. in-ear pressure of WUYI).
In my opinion, I would buy the WUYI Earbuds for my daily commute and general workouts because the combination of 128-hour battery life and ENC call technology solves the two biggest frustrations I face with audio gear: constant recharging and muffled voices on phone calls. The ability to charge my phone from the case in a pinch is also a feature I cannot ignore. However, if my primary activity were swimming or running on highways where hearing traffic is non-negotiable, I would immediately switch to the Rhyfell. For the specific need of the best open ear headphones for calls where you still need to hear your surroundings, the Rhyfell wins on safety, but for the best voice assistant headphones for calls in a busy office or street, the WUYI's active noise handling is superior.
Yes, the Rhyfell is IP68 waterproof and supports calls, but the audio quality may vary due to water interference. It is primarily designed for offline MP3 playback during swimming, so check your device settings before diving.
They offer passive noise cancellation due to the in-ear seal, which blocks significant ambient sound. If you need to hear traffic or announcements, these are less suitable than open-ear models.
Both devices offer approximately 8 hours of continuous playback on a single charge. The WUYI includes a case that extends this to 128 hours total, whereas the Rhyfell does not include a separate charging case for the headphones themselves.
The WUYI earbuds feature high-elasticity TPU ear hooks that bend flexibly to fit various ear shapes, including smaller ears, without deforming permanently.
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