eppfun AK3040Pro Max USB-C Bluetooth 5.4 Auracast Audio Transmitter

The eppfun AK3040Pro Max is a USB-C audio transmitter listing Bluetooth 5.4, Auracast sharing and support for several aptX codecs. It is intended to send audio from compatible phones, computers and consoles to wireless headphones or speakers, but low-latency playback depends on the receiving headphones supporting aptX or aptX Adaptive.

At a glance

USB-C audio transmitter for sending audio from compatible source devices to Bluetooth headphones or speakers.
Lists Bluetooth 5.4 and codecs including aptX Lossless, aptX Adaptive, aptX Low Latency, aptX HD, aptX and SBC.
Auracast is presented as an audio-sharing option for compatible Auracast headphones or speakers.
The listing names iPhone 17/16/15 Pro Max, Android smartphones, PS5, PC and Switch as compatible sources.

Price

£25.59Save 20%

Reference price: ~~£31.99~~

Price checked: 14 Nov 2026

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Pros and cons

Pros

USB-C connector and compact listed dimensions make it a small option for compatible phones, computers and consoles.
A range of listed aptX codecs gives buyers more than one possible audio mode, subject to matching support in the headphones.
Auracast offers a way to share audio with compatible receiving devices.

Cons

Low-latency playback is limited to headphones that support aptX or aptX Adaptive, so it will not deliver that benefit with every Bluetooth headset.
The adapter is for audio transmission only and is not for data transfer or peripherals such as keyboards, mice and game controllers.

Technical specifications

14 specifications

Identity
Brand	eppfun
Model	AK3040Pro Max
Connector	USB Type C
Bluetooth version	Bluetooth 5.4
Colour	Black
Finish	Matte

Audio and connectivity
Supported profiles	HFP, A2DP and AVRCP
Maximum Bluetooth coverage	about 10m
Ports	1
Plug type	No Plug

Compatibility and use
Compatible devices	Headphone, Laptop, Smartphone, Speaker

Dimensions and installation
Dimensions listed	30 x 20 x 10 millimetres
Weight listed	15 Grams

Other details
Warranty listed	1 year

What to know before buying

The listing's Bluetooth 5.4 claim and codec list are manufacturer specifications. Audio delay varies with the connected device and wireless conditions. Auracast sharing requires a compatible receiving headphone or speaker. Clear a headset's existing pairing information if it will not connect, and avoid congested or obstructed radio environments.

Listing details to confirm

Listing details are inconsistent or unconfirmed in two areas: the stated 30 x 20 x 10 millimetre dimensions and 15 Grams weight are supplied as listing figures, while performance is not independently established. The explicit contents list names only the Audio Transmitter Adapter, while a feature note mentions keyboards and mice only to say they are unsupported. No keyboard or mouse inclusion is established.

What’s in the box

Included

Audio transmitter adapter

Who is it for?

A good fit for

Buyers who need a USB-C audio transmitter for a compatible smartphone, computer or console.
Listeners with aptX or aptX Adaptive headphones who want the stated low-latency mode.
People with Auracast-capable headphones or speakers who want to explore shared audio.

Less suited to

Anyone needing a USB adapter for keyboard, mouse, controller or general data use.
Buyers expecting low latency with headphones that do not support aptX or aptX Adaptive.
Anyone planning Auracast sharing without a compatible receiving device.

eppfun AK3040Pro Max USB-C Bluetooth 5.4 Auracast Audio Transmitter · photo 2 — Additional product photo 2

Customer reviews on Amazon

3.7 / 5 · 205 ratings

5 stars50%50%
4 stars15%15%
3 stars11%11%
2 stars8%8%
1 star16%16%

Customer feedback is mixed on compatibility, sound quality and connectivity. Some customers report good operation and sound, while others report poor results, including connection problems with Sony INZONE buds. For buyers, this matters because the transmitter's listed codecs and low-latency mode depend on a suitable receiving headset, and the feedback does not indicate that compatibility or audio results are consistent across setups.

Mixed feedback

Customer feedback describes mixed compatibility and audio quality, with both favourable and unfavourable experiences.
Connectivity concerns are reported, including with Sony INZONE buds.

Frequently asked questions

Will it work with any Bluetooth headphones?

The listing names broad headphone compatibility, but codec-dependent features are not universal. Low-latency playback is stated to require aptX or aptX Adaptive support in the headphones.

Can it be used for keyboards, mice or file transfer?

No. The listing specifies audio transmission and says the adapter cannot be used for keyboards, mice, game controllers or data transfer.

Does Auracast work with any speaker or headphone?

No. The receiving headphone or speaker must support Auracast for the stated sharing feature.

What is listed in the package?

The explicit contents list names an Audio Transmitter Adapter. The feature text does not confirm any keyboard or mouse as included items.