How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want an all-in-one pair of true wireless earbuds you can toss in a bag and wear straight into the pool, choose CAPOXO Earbuds; if you need a pocket-sized USB-C DAC/amp that upgrades the wired IEMs you already own, choose BQEYZ C30. One is a self-contained listening system for swimming, commuting and calls; the other is a tiny hi-fi adapter that only makes sense if you already have good wired earphones. Let me break down what each one actually is, because the confusion between these two is real — they overlap in almost nothing except the word "audio."
• CAPOXO Earbuds — biggest strength: a complete wireless package: Bluetooth 5.3, a charging case with up to 50 hours of total playback, physical button controls, and a waterproof, semi-in-ear build you can wear without a phone tether.
• CAPOXO Earbuds — biggest trade-off: no active noise cancellation and no wired option, so its sound quality is fixed and it depends entirely on Bluetooth.
• BQEYZ C30 — biggest strength: genuine hi-res decoding (32-bit/384kHz) through a 4.4mm and 3.5mm dual output, with 10-band EQ tuning on Android and web.
• BQEYZ C30 — biggest trade-off: it has no battery, no drivers and no wireless — it's a dongle, so it's useless without a phone or computer and a pair of wired earphones.
• Who CAPOXO is for: anyone who wants one simple wireless product for the gym, the pool and phone calls.
• Who BQEYZ C30 is for: anyone who already owns wired IEMs or headphones and wants cleaner, louder, more tunable sound from a phone or laptop.
The CAPOXO N7 is a true wireless earbud set built around convenience. Each bud carries a 14.2mm dynamic driver (the spec sheet also references a 13mm driver in the marketing copy, so treat the exact figure as approximate), and it runs Bluetooth 5.3 with a rated range of about 33 feet. The headline number is battery: roughly 8 hours per charge at moderate volume, extended to about 50 hours total with the charging case, which itself supports both wireless and USB-C charging. A dual LED display on the case shows remaining power, so you're not guessing before a workout.
The design is semi-in-ear and light — about 0.17 ounces per bud — which matters if you plan to wear them for a long session. Controls are physical buttons rather than touch, which I actually prefer for swimming-adjacent use: wet fingers and touch panels rarely cooperate. You can answer calls, skip tracks, adjust volume and trigger a voice assistant without pulling out your phone. The built-in mic sits close to your mouth thanks to the curved stem, which should help call clarity. The buds also work independently, so you can hand one to a partner.
Where it fits best: pool laps, treadmill runs, commuting, TV and laptop listening, and casual calls. The waterproof build and stable fit are the reasons it works for swimming in a way most open earbuds don't.
Who should skip it: if you want active noise cancellation, this isn't that product — the noise control field is listed as "None." If you're chasing audiophile-grade resolution or want to fine-tune your sound signature with EQ, a wireless bud at this level won't give you that. And if you already own excellent wired IEMs, buying these adds a second, lesser playback chain rather than improving the one you have.
The BQEYZ C30 is not a headphone. It's a USB-C DAC and amplifier dongle — a 10-gram stick of CNC aluminum that plugs into your phone, tablet or computer and turns a digital USB-C signal into analog audio for wired earphones. It supports PCM up to 32-bit/384kHz through a dedicated DAC chip and an independent OPA amplifier, and it puts out a rated 57mW at 32Ω. That's enough headroom to drive multi-driver IEMs and many portable headphones properly.
The interesting part is the output section. You get both a 4.4mm balanced port and a 3.5mm single-ended port, and you can use them simultaneously — handy if you want to share a playlist. The 4.4mm output is the one to use with good IEMs: better channel separation, a wider soundstage and more dynamic range. The 3.5mm side covers standard headsets and broader compatibility.
Then there's the 10-band parametric EQ, adjustable through a free Android app or a web interface. You can change frequency, Q value, gain and filter type, so you can build a bass-heavy profile for one track and a vocal-forward profile for a podcast. One caveat worth knowing up front: iOS permissions block in-app tuning, so iPhone users get the hardware tuning as-is — which BQEYZ describes as strong out of the box. You can still tune on Android or web and then use the dongle with an iPhone.
Who should skip it: anyone who doesn't own wired earphones, anyone who wants to swim or work out without a cable, and anyone who wants a single product that just plays music with no phone attached. It also won't add noise cancellation to anything — it only improves the signal going to your existing headphones.
Side-by-Side: Which Should You Choose?
• Best for swimming and workouts → CAPOXO Earbuds. Fully wireless, waterproof, button controls, no cable to snag.
• Best for sound quality with wired IEMs → BQEYZ C30. 32-bit/384kHz decoding and a 57mW amp will out-resolve any budget wireless bud.
• Best for battery life → CAPOXO Earbuds. Around 8 hours per charge, about 50 hours with the case; the C30 has no battery at all.
• Best for call handling → CAPOXO Earbuds. Built-in mic, stem positioned toward your mouth, one-button call control.
• Best for tuning your sound → BQEYZ C30. 10-band parametric EQ via Android app or web interface.
• Best for sharing audio → BQEYZ C30. The 4.4mm and 3.5mm outputs can run at the same time.
• Best for travel weight → BQEYZ C30. 10 grams versus a full earbud-and-case kit.
• Best all-in-one simplicity → CAPOXO Earbuds. No dongle, no wired earphones, no app required.
For the swimming use case that frames this whole comparison, I'd buy the CAPOXO Earbuds. Bluetooth 5.3, a waterproof semi-in-ear fit, physical buttons that work with wet hands and roughly 50 hours of case-backed playback make it the only one of the two that's actually usable in a pool. The BQEYZ C30 is a genuinely nice piece of kit, but it needs a phone and a cable and a pair of wired IEMs to do anything at all — which is the opposite of what you want mid-lap. In my opinion, if you already own serious wired earphones and want to hear them properly from your phone, the C30 is the smarter upgrade. Everyone else should take the wireless pair.
FAQ
CAPOXO Earbuds, without question. They're a waterproof, fully wireless set with no cable, while the BQEYZ C30 is a wired USB-C dongle that needs a phone and wired earphones to function — impractical in water.
No. The noise control field is listed as "None," so they rely on the semi-in-ear seal and volume rather than active noise cancellation. If noise cancelling is your priority, neither of these is the right pick.
Yes. It works plug-and-play with iPhone 15/16 series and supports iOS. The one limitation is EQ tuning — iOS permissions block the app, so iPhone users get the hardware tuning as shipped, or can tune via Android or web first.
Yes. The C30 is a DAC and amplifier, not a headphone — it converts USB-C audio to 3.5mm and 4.4mm outputs. Without a pair of wired earphones, it has nothing to drive. And since prices and availability change, check the current price on Amazon before deciding.
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.
See also: WC PadZ QC25 vs hopopower Replacement Earpads, SOULWIT Earpads vs Sumugaric Jabra Elite 85h: Memory Foam, Krone Kalpasmos Professional Replacement Bose vs Floriogra 3, Turtle Beach Elite Pro vs HyperX Cloud Revolver