Monodeal S870 Bone Conduction Headphones, Bluetooth 5.4, IP68, 8GB MP3

IP68: Monodeal S870 Bone Conduction Headphones combine an open-ear design with Bluetooth playback and a built-in MP3 mode. The listing describes them for swimming and sports, with an 8GB player for listening without a phone connection and a stated battery life of up to eight hours.

At a glance

The open-ear bone-conduction design leaves the ear canals uncovered.
Bluetooth 5.4 and an MP3 mode are described, so stored music can be used without a phone connection.
The listing claims IP68 waterproofing and describes use for swimming and other water sports.
Button controls are listed for playback and calls. The supplied battery claim is up to eight hours.

Price

£42.47Save 15%

Reference price: ~~£49.99~~

Price checked: 14 Nov 2026

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Pros and cons

Pros

Built-in MP3 playback is useful in the water, where the listing says Bluetooth does not work underwater.
Open-ear placement keeps the ear canals clear and can help users remain aware of surrounding sounds.
The stated two-hour charge time is paired with a listed eight-hour battery life.

Cons

An open-ear design does not isolate the listener from surrounding noise, which may be a drawback in noisy settings.

Technical specifications

18 specifications

Identity
Brand	Monodeal
Model	Bone Conduction Headphones S870
Colour	Light grey
Ear placement	Open Ear
Earpiece shape	bone conduction
Form factor	True Wireless

Connectivity and controls
Wireless connection listed	Wireless
Wireless technology	Bluetooth
Bluetooth version	5.4
Bluetooth range	10 Metres
Control method	Push Button

Power and battery
Battery life listed	8 Hours
Charging time	2 Hours

Materials and protection
Water resistance listed	Waterproof

Other listed details
Audio driver type	Bone Conduction Driver
Compatible devices	Cellphones
Included components listed	User Manual
Manufacturer warranty listed	1 Year Manufacturer

What to know before buying

Listing details to confirm

The title claims 32GB memory, but feature and product-description text specifies a built-in 8GB MP3 player. Verify the storage capacity for the selected listing. The feature text also claims up to 1,500 songs, without resolving that discrepancy.

What’s in the box

Included

User manual

Who is it for?

A good fit for

Swimmers who want stored MP3 playback without relying on Bluetooth underwater.
Runners, cyclists and sports users who prefer an open-ear design.
Buyers seeking button controls and a claimed eight-hour battery life.

Less suited to

Listeners who need noise isolation or an in-ear fit.
Buyers who require confirmed 32GB storage before purchase.

Monodeal S870 Bone Conduction Headphones, Bluetooth 5.4, IP68, 8GB MP3 · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.4 / 5 · 930 ratings

5 stars71%71%
4 stars14%14%
3 stars6%6%
2 stars2%2%
1 star7%7%

Customer feedback highlights comfort, ease of use, sound quality, Bluetooth connectivity, battery life and reports of underwater use, including snorkeling. Those points are relevant to the open-ear design, listed eight-hour battery life and swimming-oriented MP3 mode, but individual results may differ. The overall rating distribution is mostly five-star, with a smaller but noticeable one-star share, so the aggregate does not show whether the concerns relate to fit, sound or another aspect.

Positive themes

Customers report comfort and ease of use, and praise sound quality and Bluetooth connectivity.
Feedback describes good battery life and use underwater, including a snorkeling example.

Frequently asked questions

Can these headphones play music without a phone?

The listing describes an 8GB built-in MP3 player for offline listening. Bluetooth is listed for wireless connection, but the description says it does not work underwater.

Are the headphones suitable for swimming?

The listing claims IP68 waterproofing and describes swimming use. This is a manufacturer claim rather than an independently verified performance result.

How much storage do they have?

The title says 32GB, while feature and product-description text says 8GB. Check the selected listing before buying if capacity matters.

How long does the battery last?

The listed battery life is 8 Hours, and the feature text describes up to eight hours of music or calls with a full charge taking about two hours.