How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-20 · 7 min read · Independent comparison
• MUSICOZY 5.4's biggest strength: it is a complete sleep-and-relaxation tool — an eye mask with ultra-thin speakers built in, up to 14 hours of playback, and a memory foam and ice silk build made for side sleepers.
• MUSICOZY 5.4's biggest trade-off: it only works as headphones for you — there is no 3.5mm input, no transmitter function, and it cannot send audio to any other device.
• Twelve South AirFly SE's biggest strength: it converts any standard 3.5mm audio jack — airplane seatback screens, gym treadmills, hotel TVs, handheld consoles — into a Bluetooth signal for your own earbuds or headphones, with 20+ hours of battery.
• Twelve South AirFly SE's biggest trade-off: it makes no sound on its own. Without a paired pair of Bluetooth headphones, it does nothing.
• Pick MUSICOZY 5.4 if your goal is sleeping, meditation, or travel relaxation with the audio already built into what you wear.
• Pick Twelve South AirFly SE if your goal is untethering from a wired jack on a plane, a treadmill, or a TV using headphones you already own.
The MUSICOZY 5.4 is a Bluetooth 5.4 sleep mask with headphones sewn into the fabric. That single sentence is the whole product. The speakers are ultra-thin and silicone-covered, specifically shaped so you can lie on your side without a hard plastic housing digging into your ear. The body is memory foam with an ice silk and soft cotton lining, and the whole thing weighs 105 g. It pairs wirelessly within a Bluetooth range of about 10 meters, so your phone can sit on the nightstand or across the room while you drift off.
On the audio side, the specs are modest but sensible for the job: a 32-ohm dynamic driver, a 20 Hz to 20,000 Hz frequency range, and tuning described as deep bass with clear treble. That is not a critical-listening setup, and it isn't meant to be. It's an audio layer for falling asleep to a podcast, a guided meditation, or rain sounds. The battery is the practical part: a 2-hour charge gets you up to 14 hours of playback, and there are no beeping low-battery alerts to wake you at 3 a.m. Controls are simple push buttons, and the mask charges over USB-C.
Who should buy it: side sleepers, people with a snoring partner or a noisy commute who want masking sound without earbuds pressing into their ears, frequent flyers who want to sleep through a red-eye, and anyone doing yoga, meditation, or relaxation work who wants hands-free audio plus a blackout mask. It also makes a straightforward gift for teens and adults. Who should skip it: anyone who wants to listen to a seatback movie on a plane, anyone who needs to transmit audio to other headphones, and anyone expecting audiophile-grade sound. This is comfort-first hardware, and you should judge it that way. MUSICOZY backs it with a 12-month warranty, a 60-day refund policy that doesn't require returning the item, and a 90-day free replacement for quality issues.
The Twelve South AirFly SE solves a completely different problem. It's a small white plastic transmitter, 13.61 g, measuring roughly 0.38" by 1.25" by 1.75". You plug it into a 3.5mm headphone jack, power it on, and it enters pairing mode automatically — the light flashes white and amber. Put your Bluetooth headphones in pairing mode, and the AirFly SE connects within seconds. After that first pairing, it reconnects to the same headphones automatically on future uses. That "it just works next time" behavior is the part that matters, because the whole point is not fiddling with settings when you're boarding a flight.
Compatibility is broad. It works with any Bluetooth headphones or earbuds that can enter pairing mode — AirPods, Bose, Sony, Beats, Samsung Galaxy Buds, and so on. It supports Bluetooth 5.2 along with aptX and SBC, outputs stereo, and installs as simply as plugging in. Volume is handled with built-in touch controls, so you're not reaching for your phone mid-flight. Battery life is rated at 20+ hours per charge, which comfortably covers a long-haul flight or several gym sessions, and it charges over USB-C. Critically, it can be used while charging, so a dead battery isn't a hard stop if you have a cable and a USB port nearby.
One honest caveat the manufacturer itself raises: hearing aids are hit-or-miss. AirFly SE may work with hearing aids that support standard Bluetooth and can enter pairing mode without an app, but hearing aids using Bluetooth Low Energy or requiring a companion app are not compatible — and implementations vary by brand, so it's worth checking with your hearing aid maker first. Who should buy it: air travelers stuck with seatback screens, gym-goers on treadmills and bikes with 3.5mm jacks, hotel guests with wired TVs, Nintendo Switch players, and anyone with an older car stereo that has an aux input but no Bluetooth. Who should skip it: anyone who doesn't own Bluetooth headphones, and anyone hoping it will produce sound by itself.
Side-by-Side: Which Should You Choose?
• Best for sleep and side sleeping → MUSICOZY 5.4. The ultra-thin silicone speakers and memory foam build are designed around lying down; the AirFly SE is not something you wear.
• Best for battery life → Twelve South AirFly SE. 20+ hours versus 14 hours, plus it can run while charging.
• Best for all-night use without interruptions → MUSICOZY 5.4. No beeping battery alerts, and 14 hours covers a full night.
• Best for gym equipment and hotel TVs → Twelve South AirFly SE. Any 3.5mm jack becomes a wireless source.
• Best for meditation, yoga and relaxation → MUSICOZY 5.4. Audio plus a blackout mask in one item you wear.
• Best for people who already love their headphones → Twelve South AirFly SE. It adds wireless freedom to gear you've already chosen.
• Best for gifting → MUSICOZY 5.4. It's a self-contained, immediately usable product for a wide age range.
In my opinion, the deciding question isn't which device is better — it's what you're trying to fix. If your problem is falling asleep or relaxing with audio and you want one thing to put on your head, I'd buy the MUSICOZY 5.4. It's a finished product: mask, speakers, controls, and battery in one piece, and the design details — thin silicone speakers, memory foam, no low-battery beeps — are aimed squarely at that use case. I'd only steer you to the Twelve South AirFly SE if you already own Bluetooth headphones and your real frustration is a cable or a 3.5mm jack on a plane, treadmill, or TV. Whichever fits your situation, check the current price on Amazon before deciding.
MUSICOZY 5.4, clearly. It's a sleep mask with built-in headphones, memory foam cushioning, and no beeping alerts. The AirFly SE is a transmitter you plug into a jack — it isn't worn on your face and produces no sound on its own.
Does the Twelve South AirFly SE work with AirPods and other earbuds?
No. MUSICOZY 5.4 is a wireless Bluetooth receiver built into a sleep mask; it pairs with your phone or tablet within about 10 meters. For a wired seatback jack, you want the AirFly SE instead.
MUSICOZY 5.4 charges in about 2 hours and gives up to 14 hours of playback. The Twelve South AirFly SE is rated at 20+ hours and can be used while charging over USB-C.
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.