Haylou S40

Name: Haylou S40
Brand: Haylou
SKU: 7091

Manufacturer: Haylou

The Haylou S40 is an over-ear headphone designed for extended listening sessions, offering both wireless and wired connectivity options. It features a foldable build with a detachable, tangle-free cable, making it reasonably suited for travel despite the absence of an included carrying bag. With a weight of 280 g and stereo speakers, the S40 covers a broad range of use cases from casual listening to hands-free calls, supported by a removable microphone and a control panel on the device itself.

On the technical side, the S40 runs on Bluetooth 6 with a maximum wireless range of 20 m and an audio latency of 80 ms. It supports LDAC and AAC codecs alongside active noise cancellation, passive noise isolation, and spatial audio. The 40 mm driver units operate within a 20 Hz to 20,000 Hz frequency range at 32 Ohms impedance and a sound pressure level of 97 dB/mW. A 650 mAh rechargeable battery delivers up to 90 hours of playback, or 60 hours with ANC enabled, and charges fully in around 2.5 hours via USB Type-C. An 11-microphone array with noise cancellation and two-device multipoint connectivity round out the feature set.

Pros

Battery life extends up to 90 hours on a single charge, dropping to a still-substantial 60 hours with ANC active
Bluetooth 6 with LDAC support enables high-resolution wireless audio transmission
An 11-microphone array with noise cancellation makes it capable for calls and voice use
Foldable build combined with a detachable, tangle-free cable adds practical portability
Supports simultaneous connection to two devices via multipoint pairing
Ambient sound mode allows controlled awareness of surrounding audio without removing the headphones

Cons

No water resistance, limiting use in rain or high-humidity environments
Lacks fast pairing and NFC pairing, making initial device connections more manual
No in/on-ear detection means music does not pause automatically when the headphones are removed
No wireless charging support despite the relatively long charge time of 2.5 hours
No travel bag is included, which is a notable omission given the foldable design
Mute function is absent, which may be inconvenient during calls

Who is this for?

The Haylou S40 is well-suited for users who prioritize extended listening sessions, as its battery delivers up to 90 hours of playback — making it a strong fit for frequent travelers, remote workers, or anyone who needs reliable audio throughout long days without regularly reaching for a charger. The combination of active noise cancellation, passive noise isolation, and an 11-microphone array also makes it a practical choice for people who regularly take calls or need to focus in noisy environments such as open offices or commutes. Those who switch between devices frequently will also benefit from its two-device multipoint support and the flexibility of both wired and wireless connectivity.

Who is this NOT for?

Users who need headphones for outdoor or high-moisture environments will find the S40 lacking, as it offers no water resistance whatsoever, making it unsuitable for workouts, running, or use in rainy conditions. Audiophiles or listeners who rely on a broad codec ecosystem may also find it limited, given the absence of aptX, aptX HD, aptX Adaptive, and Bluetooth LE Audio support. Additionally, the lack of in/on-ear detection and a mute function means it is less convenient for users who frequently pause and resume playback or need quick muting during calls, and the absence of a travel bag makes it a less complete option for users who want an all-in-one portable package out of the box.

Design:

Fit	Over-ear
weight	280 g
has a detachable cable	✓
water resistance	None
can be folded	✓
is designed for kids	✕
has a tangle free cable	✓
travel bag is included	✕
has an open-back design	✕
has stereo speakers	✓

The Haylou S40 uses an over-ear fit and weighs 280 g, with a closed-back design that contributes to passive sound isolation. It is built with portability in mind, as the headphone can be folded and comes with a detachable, tangle-free cable, though no travel bag is included. The headset is not intended for kids and carries no water resistance rating. It features stereo speakers and is not designed with an open-back acoustic configuration.

Sound quality:

has active noise cancellation (ANC)	✓
lowest frequency	20 Hz
highest frequency	20000 Hz
driver unit size	40 mm
impedance	32 Ohms
supports spatial audio	✓
sound pressure level	97 dB/mW
has a neodymium magnet	✕
has passive noise reduction	✓

The Haylou S40 covers a frequency range of 20 Hz to 20,000 Hz through 40 mm driver units, with an impedance of 32 Ohms and a sound pressure level of 97 dB/mW. It supports both active noise cancellation and passive noise reduction, helping to limit unwanted ambient sound in either mode. The headphone also supports spatial audio, adding a positional dimension to playback. The drivers do not use a neodymium magnet.

Power:

Battery life	90 hours
Battery life (ANC)	60 hours
charge time	2.5 hours
Has USB Type-C	✓
has a battery level indicator	✓
has wireless charging	✕
battery power	650 mAh
Has a solar power battery	✕
has a rechargeable battery	✓
has a removable battery	✕

The Haylou S40 is equipped with a built-in 650 mAh rechargeable battery that is not removable, delivering up to 90 hours of playback under standard conditions or 60 hours when active noise cancellation is enabled. A full charge takes 2.5 hours via USB Type-C, and a battery level indicator lets users keep track of remaining charge. The headphone does not support wireless charging and has no solar charging capability.

Connectivity:

connectivity	Wireless & wired
Bluetooth version	6
has aptX Adaptive	✕
has aptX	✕
has LDAC	✓
has LDHC	✕
has Bluetooth LE Audio	✕
has aptX Low Latency	✕
has aptX HD	✕
has aptX Lossless	✕
has AAC	✓
has Auracast	✕
audio latency	80 ms
maximum Bluetooth range	20 m
has fast pairing	✕
supports Bluetooth pairing using NFC	✕

The Haylou S40 supports both wireless and wired connectivity, using Bluetooth 6 with a maximum range of 20 m and an audio latency of 80 ms. Among audio codecs, it is compatible with LDAC and AAC, while aptX, aptX HD, aptX Adaptive, aptX Low Latency, aptX Lossless, and LDHC are not supported. Bluetooth LE Audio and Auracast are also absent. The headphone does not offer fast pairing or NFC-based pairing.

Features:

has a noise-canceling microphone	✓
has ambient sound mode	✓
has in/on-ear detection	✕
number of microphones	11
has a mute function	✕
multipoint count	2
control panel placed on a device	✓
can be used as a headset	✓
Has an in-line control panel	✕

The Haylou S40 includes an 11-microphone array with noise cancellation, making it usable as a headset for calls, and it also features an ambient sound mode to let in environmental audio when needed. Controls are handled through an on-device panel rather than an in-line cable remote. The headphone supports multipoint connectivity for up to 2 devices simultaneously, though it lacks in/on-ear detection for automatic playback pausing and does not have a dedicated mute function.

Miscellaneous:

has a removable microphone	✓

The Haylou S40 comes with a removable microphone, allowing users to detach it when it is not needed.

Final Verdict

The Haylou S40 is a feature-rich over-ear headphone that makes a strong case for users seeking long-haul wireless audio without compromise. Its standout attribute is undoubtedly its 90-hour battery life, which — paired with active noise cancellation, LDAC support, Bluetooth 6, and an 11-microphone array — positions it as a capable daily driver for commuters, remote workers, and frequent travelers. Some limitations, including the absence of water resistance, a restricted codec selection, and the lack of conveniences like in/on-ear detection or a dedicated mute function, mean it may not satisfy every type of user. Still, for those whose priorities center on endurance, call quality, and versatile connectivity, the Haylou S40 delivers a well-rounded specification set that holds up well for its intended use cases.