We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-20 · 8 min read · Independent comparison
If you want long battery life, app-tuned sound and a comfortable over-ear fit for work, travel and calls, choose Amazon Renewed JBL T720BTBLK; if you need headphones that keep playing music while you're actually submerged in a pool, choose Aiandcc Swimming Headphones. These two look like they belong in the same shopping cart, but they solve completely different problems. One is a do-everything wireless headphone for daily life on land. The other is a waterproof MP3 player you wear on your cheekbones so you can swim laps without your phone. Pick based on where you'll wear them most, not on which spec sheet looks shinier.
• Amazon Renewed JBL T720BTBLK — biggest strength: Up to 76 hours of playtime, Bluetooth 5.3, JBL Pure Bass tuning and a free app for custom EQ, in an over-ear design you can fold up and take anywhere.
• Amazon Renewed JBL T720BTBLK — biggest trade-off: It's a renewed unit with a 90-day limited warranty, and it is not designed for swimming or heavy sweat exposure.
• Aiandcc Swimming Headphones — biggest strength: IPX8 waterproofing (immersion up to 2 meters for 1 hour) plus a built-in 32GB MP3 player, so music keeps playing where Bluetooth can't reach.
• Aiandcc Swimming Headphones — biggest trade-off: Playtime is around 8 hours, the open-ear bone conduction design gives you less bass isolation than an over-ear headphone, and you have to manage your own MP3 files for water use.
• Who the JBL is for: Commuters, remote workers, students and travelers who want one wireless headphone for music, calls and long days away from a charger.
• Who the Aiandcc is for: Swimmers, triathletes, runners and cyclists who want music in the water and full awareness of their surroundings on land.
The JBL Tune 720BT is a mainstream over-ear wireless headphone that happens to be sold here as an Amazon Renewed unit. What that means in practice: you get the same model number (JBLTU720BTBLK-RB), the same Bluetooth 5.3 radio, the same dynamic drivers covering 20 Hz to 20,000 Hz, and the same 220 g plastic over-ear build — backed by a 90-day limited warranty rather than a full new-product warranty. If you're comfortable with that trade-off, it's a lot of headphone for everyday use.
The standout number is battery life: up to 76 hours of average playtime, with a 2-hour charge time. That's the kind of figure that changes how you use a headphone. You stop thinking about charging. A commute, a work week, a long flight, a weekend trip — one charge can plausibly cover all of it. Add Bluetooth 5.3 for a stable wireless connection to your phone, and a 3.5 mm jack as a wired fallback when you want zero latency or you're out of battery, and you have a genuinely flexible daily driver.
Who should buy it: Anyone who wants one wireless over-ear headphone for music, podcasts, video calls and travel, and who values marathon battery life over water resistance. The foldable, lightweight design and included cable make it easy to toss in a bag.
Who should skip it: Swimmers, and anyone who needs guaranteed water protection. There's no IP rating in the specs here, so treat it as a dry-land headphone. Also skip it if you specifically want active noise cancellation or a brand-new sealed unit — this is renewed, with a 90-day limited warranty.
Aiandcc Swimming Headphones: Who It's For
The Aiandcc Swimming Headphones (model S10) are a very different animal. The core insight behind them is simple and correct: Bluetooth signals don't transmit well underwater. So instead of pretending a wireless connection will work in a pool, Aiandcc built a 32GB MP3 player directly into the headphones. You load your music onto the device, switch to MP3 mode, and swim. The 32GB capacity is quoted as room for up to 8,000 songs, and supported formats are MP3, WAV, APE and WMA. Bluetooth 5.4 is still there for land use, so you can pair with your phone for running, cycling or the gym and then flip to MP3 mode when you get in the water.
The waterproofing is the headline spec: IPX8, meaning immersion up to 2 meters for up to 1 hour. That covers pool laps and most water sports. The build uses silicone and a flexible memory titanium frame, and the whole thing weighs just 36.6 g. That matters because bone conduction headphones transmit sound through vibration against your cheekbones rather than firing into your ear canal — they have to sit lightly and stay put. Aiandcc says the design is compatible with swim caps, goggles and helmets, which is exactly the scenario where a flimsy fit falls apart.
The open-ear design is a genuine functional choice, not a gimmick. Because nothing blocks your ear canal, you stay aware of traffic, other swimmers and your surroundings — a real safety argument for outdoor running and cycling. The trade-off is the same one every bone conduction headphone makes: less bass slam and less isolation than a sealed over-ear cup. There's also a built-in microphone for calls, an LED display showing battery level and mode, magnetic fast charging that fills the battery in about 1 hour, and around 8 hours of playtime depending on mode. Two test songs come pre-loaded so you can check audio right after unboxing.
Who should buy it: Swimmers, pool athletes, triathletes, and runners or cyclists who want music plus situational awareness. Also a good fit if you want to leave your phone behind entirely during a workout, thanks to the onboard MP3 storage.
Who should skip it: Anyone who mainly wants immersive, bass-heavy listening at a desk or on a plane. The open-ear bone conduction design and lack of any noise control make it the wrong tool for that job. And if you don't want to manage MP3 files, the water mode won't do much for you.
• Best for battery life → Amazon Renewed JBL T720BTBLK. Up to 76 hours of playtime versus roughly 8 hours on the Aiandcc.
• Best for swimming → Aiandcc Swimming Headphones. IPX8 waterproofing and an MP3 mode that works where Bluetooth cannot.
• Best for calls and meetings → Amazon Renewed JBL T720BTBLK. Push-button call control, Voice Aware and a built-in app for tuning.
• Best for safety outdoors → Aiandcc Swimming Headphones. The open-ear design keeps you aware of traffic and surroundings, and 36.6 g is barely noticeable.
• Best for sound customization → Amazon Renewed JBL T720BTBLK. The JBL Headphones App gives you preset EQ modes and manual EQ adjustment.
• Best for phone-free workouts → Aiandcc Swimming Headphones. 32GB of onboard storage means no phone required at all.
• Best for travel and commuting → Amazon Renewed JBL T720BTBLK. Foldable over-ear build, Bluetooth 5.3, plus a 3.5 mm jack for wired listening.
• Best for fast top-ups → Aiandcc Swimming Headphones. About 1 hour to full charge, with an LED display so you always know your battery state.
In my opinion, these aren't competitors — they're complements, and the right pick comes down to one question: do you need music underwater? If yes, buy the Aiandcc Swimming Headphones. Nothing about the JBL Tune 720BT is designed for a pool, and no amount of tuning fixes that. If your listening happens on land, I'd buy the Amazon Renewed JBL T720BTBLK. Seventy-six hours of playtime, Bluetooth 5.3, app-based EQ and a foldable over-ear design make it the more useful headphone for the vast majority of people, as long as you're comfortable with a renewed unit and a 90-day limited warranty. If you swim seriously and also want a daily headphone, I'd genuinely consider owning both rather than forcing one to do the other's job. Check the current price on Amazon for whichever one matches your routine.
FAQ
No. Nothing in the specs indicates water resistance, so it's a dry-land headphone. For swimming you need the Aiandcc, which is rated IPX8 for immersion up to 2 meters for 1 hour.
No. Bluetooth signals don't transmit effectively through water, which is exactly why Aiandcc includes a 32GB MP3 player. Load your music, switch to MP3 mode, and swim — then switch back to Bluetooth for land use.
The Amazon Renewed JBL T720BTBLK, by a wide margin: up to 76 hours of average playtime versus about 8 hours on the Aiandcc, which charges in roughly 1 hour via magnetic charging.
Yes, in different ways. The JBL offers push-button call control, volume and media control plus Voice Aware so you can hear yourself talking. The Aiandcc has a built-in microphone for calls and is best suited to land use, where Bluetooth is active.
It's a renewed unit rather than a new sealed one, and it carries a 90-day limited warranty. The model, Bluetooth 5.3 radio, drivers and 76-hour battery spec are the same as the standard Tune 720BT.
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