Haylou S40 VS Ugreen Studio Pro

From a design standpoint, the Haylou S40 and Ugreen Studio Pro share an almost identical feature profile: both are over-ear, closed-back headphones that fold for portability, come with a detachable and tangle-free cable, and offer no water resistance. For most users evaluating design priorities, these shared traits mean day-to-day usability is largely equivalent between the two models.

The one meaningful differentiator in this category is weight. The S40 comes in at 280 g versus the Studio Pro's 315 g — a difference of 35 grams. While this gap may sound small on paper, it becomes more noticeable during extended listening sessions, where additional weight translates directly into greater fatigue on the neck and headband pressure on the skull. For users who wear their headphones for hours at a stretch, the lighter S40 offers a tangible ergonomic advantage.

Overall, the Haylou S40 holds a design edge in this comparison, strictly due to its lower weight. Every other design attribute examined here is identical, making weight the single deciding factor for users who prioritize long-term wearing comfort.

At the core of both headphones' sound profiles lies an identical foundation: 40 mm drivers, a shared low-end floor of 20 Hz, active noise cancellation, passive noise reduction, and spatial audio support. For the vast majority of listening scenarios, this common ground means neither headphone has a structural advantage in terms of noise isolation capability or driver architecture.

Where the two models diverge is at the top of the frequency range. The S40 cuts off at the standard 20,000 Hz ceiling of human hearing, while the Studio Pro extends to 40,000 Hz — squarely in hi-res audio territory. In practice, humans cannot directly perceive frequencies above roughly 20 kHz, so this difference is less about audible content and more about headroom: a wider frequency ceiling can reduce phase distortion in the upper registers and may result in a marginally cleaner, more accurate reproduction of the highest audible frequencies, particularly for critical listeners or audiophiles playing high-resolution audio files.

The Ugreen Studio Pro holds a technical edge in this category on the basis of its extended high-frequency response. While the real-world audibility of that advantage is debatable, it is the sole differentiating data point here, and for users who prioritize hi-res audio fidelity or work in audio production, it is a meaningful one.

Battery performance is where the Ugreen Studio Pro pulls ahead most decisively. Its 820 mAh cell delivers a rated 120 hours of playback, compared to the S40's 650 mAh battery and 90-hour claim. That 30-hour gap is substantial — for a typical listener putting in 3–4 hours a day, the Studio Pro could go nearly two additional weeks before needing a charge. This makes it particularly compelling for frequent travelers or users who dislike keeping track of charging routines.

The charging speed gap reinforces this advantage. The Studio Pro replenishes fully in just 1.5 hours, while the S40 requires 2.5 hours — an entire hour longer. Both use USB Type-C, which is the modern standard, so cable compatibility is a non-issue for either. Neither model supports wireless charging, keeping that variable off the table.

Across every meaningful power metric, the Ugreen Studio Pro holds a clear edge: it carries more capacity, lasts longer on a charge, and refuels faster. For users who prioritize set-it-and-forget-it battery convenience, this category is not particularly close.

Connectivity-wise, the Haylou S40 and Ugreen Studio Pro are built on the same backbone: both run Bluetooth 6, support both wireless and wired connections, and share an identical codec lineup — LDAC for high-quality wireless audio and AAC for Apple ecosystem compatibility. Neither supports aptX variants, LE Audio, or Auracast, so users dependent on those specific codecs will find both headphones equally unsuitable.

The two meaningful differentiators here pull in opposite directions. The Studio Pro achieves a lower audio latency of 60 ms versus the S40's 80 ms, which matters most for video content consumption and casual gaming — the tighter the latency, the less noticeable any lip-sync drift. The S40, however, offers a longer maximum Bluetooth range of 20 m compared to the Studio Pro's 15 m, giving users more freedom to move away from their source device without dropouts.

This group ultimately comes down to use-case priority. For users who watch video or game wirelessly, the Studio Pro's latency advantage is the more practically impactful edge. For those who frequently leave their phone in one room while moving around, the S40's extended range is the deciding factor. Neither product dominates outright — the two headphones trade blows on the only two specs that differ.

Much of the feature set here is a wash: both headphones offer ambient sound mode, on-device controls, noise-canceling microphones, dual-device multipoint pairing, and headset functionality. For call quality and everyday usability, these shared capabilities put both models on equal footing across the board.

The one standout differentiator is the microphone count. The Haylou S40 deploys an unusually high 11 microphones, compared to the Studio Pro's more conventional 4. A larger microphone array generally enables more sophisticated beamforming — the process of isolating the speaker's voice while suppressing surrounding noise — which can translate to cleaner call quality and more effective ANC processing. Whether the S40's implementation fully capitalizes on that hardware advantage cannot be determined from specs alone, but the raw array size does represent a significant architectural difference, particularly for users who prioritize voice call clarity or use their headphones in loud environments.

On the strength of its substantially larger microphone array, the Haylou S40 holds the edge in this category. All other features are identical, making the 11-microphone configuration the sole — but notable — differentiator for call-centric or noise-cancellation-focused users.