MONODEAL S820-AU Swimming Bone Conduction Headphones, Bluetooth 5.4

MONODEAL S820-AU swimming headphones combine an open-ear bone-conduction design with Bluetooth 5.4 and onboard MP3 playback. The listing says to use MP3 mode underwater because Bluetooth does not work there, making stored audio the relevant swimming feature.

At a glance

Listing describes IP68 protection and says the headphones can be used underwater. It also states immersion up to 2 meters for 2 hours.
8GB MP3 storage is intended for listening while swimming, when Bluetooth is unavailable underwater.
Bluetooth 5.4 is listed for use out of the water, with a stated range of up to 10 metres.
Open-ear bone conduction design keeps the ears uncovered, according to the product description.

Price

$59.49Save 15%

Reference price: ~~$69.99~~

Price checked: 13 Nov 2026

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Pros and cons

Pros

Onboard 8GB MP3 storage supports playback underwater without a Bluetooth connection.
The listing combines open-ear listening with a waterproof swimming design.
A built-in microphone and button controls are listed for everyday operation.

Technical specifications

14 specifications

Identity
Brand	MONODEAL
Model	S820-AU

Design and use
Ear placement	Open Ear
Form factor	True Wireless
Colour	Black-1
Audio driver	Dynamic Driver
Microphone	Yes

Connectivity and controls
Wireless connection listed	Bluetooth 5.4
Bluetooth range	10 Meters
Control methods listed	Push Button
Headphone jack	No Jack

Power and battery
Battery life listed	8 Hours

Materials and protection
Water resistance listed	Waterproof
Enclosure material	Plastic

What to know before buying

Listing details to confirm

The listing details are inconsistent about noise control, describing both open-ear listening and Active Noise Cancellation. It also lists a 3.5mm Audio hardware interface while separately specifying No Jack. The listing calls the design True Wireless despite describing bone conduction headphones. Clarify these details if they affect your choice. Bluetooth is stated not to work underwater, so use MP3 mode for swimming. The stated immersion limit is 2 meters for 2 hours. The listed 8-hour battery life is a manufacturer claim. Actual playback time is not specified by operating mode.

Who is it for?

A good fit for

Swimmers wanting stored music during laps without relying on underwater Bluetooth.
Runners and cyclists seeking open-ear headphones for exercise outside the water.
Buyers who prefer physical button controls and listed Bluetooth connectivity.

Less suited to

Listeners who need Bluetooth audio while submerged.
Buyers who require a clearly specified wired connection or confirmed active noise cancellation.

MONODEAL S820-AU Swimming Bone Conduction Headphones, Bluetooth 5.4 · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.4 / 5 · 661 ratings

5 stars71%71%
4 stars17%17%
3 stars5%5%
2 stars1%1%
1 star6%6%

Customer feedback describes the headphones as comfortable, lightweight and secure-fitting, with positive impressions of sound quality and water resistance, including use for ocean snorkelling. Bluetooth connectivity and durability receive mixed feedback. These reports matter in context: the listing itself says Bluetooth is unavailable underwater, and buyers planning frequent swimming may want to weigh the mixed durability comments alongside the stated waterproof design.

Positive themes

Customers report comfortable wear and a fit that stays in place.
Customers speak positively about sound quality and water resistance.

Mixed feedback

Feedback on Bluetooth connectivity is mixed, with a reported limitation underwater that matches the listing's MP3-mode guidance.
Durability feedback is mixed, with some customers describing breakage and others finding the headphones durable.