OnePlus Buds 4 Wireless Earbuds Obsidian Green

Dual Drivers · Dual DAC · LHDC 5.0

Flagship Audio in the Mid-Range

Most TWS earbuds at this price point use a single dynamic driver — one speaker element covering the full frequency range from bass to treble. A single driver must compromise somewhere: optimising for bass extension limits high-frequency clarity, and vice versa. The Buds 4’s 11mm woofer and 6mm tweeter divide the frequency work so each driver operates in its optimal range — the woofer reproduces bass and lower midrange where a large driver excels, while the tweeter handles the upper frequencies where small, light drivers respond fastest. Each driver is powered by its own DAC, meaning the digital audio signal is converted to analogue separately for each frequency band before reaching the drivers — this eliminates the signal mixing that occurs when one DAC drives both elements, reducing crosstalk and improving stereo separation and imaging. LHDC 5.0 is currently the highest-bandwidth Bluetooth audio codec available at 1Mbps — compared to AAC’s ~250kbps and LDAC’s 990kbps ceiling, LHDC 5.0’s 1Mbps bandwidth supports 24-bit depth at 192kHz sample rate, technically meeting the Hi-Res Audio standard without compression artefacts audible on modern audio tracks. LHDC 5.0 full-rate streaming requires a compatible OnePlus phone running OxygenOS 15.0 or later; on other Android or iOS devices, AAC or SBC is used but the dual-driver audio quality remains the same.

55dB ANC · Adaptive Mode

Noise Cancellation That Adjusts Itself

The Buds 4’s hybrid ANC system combines feedforward microphones (outside the earbud, facing outward) with feedback microphones (inside the earbud, facing the ear canal) and a real-time processing algorithm to cancel noise across a 5.5kHz frequency range. The 55dB rated noise reduction applies primarily to constant low-frequency noise sources — aircraft and train cabin hum, road traffic at distance, HVAC systems, office background noise — where ANC is most effective. At higher frequencies, ANC effectiveness reduces; sudden impact sounds are not cancelled. Adaptive Mode is the Buds 4’s environmental awareness feature: rather than requiring manual switching between ANC mode (maximum isolation) and Transparency mode (ambient sound pass-through), the algorithm monitors the acoustic environment continuously and transitions between modes automatically. In a quiet office, full ANC activates. Moving outdoors near traffic, the system shifts toward a blended mode that maintains some isolation while passing through directional sound cues. The 3-mic AI call system runs a separate algorithm during phone calls to identify the user’s voice and filter out background noise from the outbound call audio — office noise, traffic and wind are reduced in the microphone signal before transmission, improving voice clarity for the person on the other end of the call.

45hr Battery · 10min Fast Charge

Battery Life for Real Schedules

The Buds 4 deliver 11 hours of continuous playback per earbud with ANC off and AAC codec — enough for most full working days without returning to the case. With ANC on, earbud battery drops to 6 hours per charge; the case top-up then extends total available listening time to 24 hours with ANC enabled (45 hours with ANC off). The battery figures are notably higher with ANC off because the ANC processing circuit runs continuously and draws significant current. The fast charging specification — 10 minutes in the case produces 11 hours of playback — is the most practically useful battery feature for daily use: on a morning commute where the earbuds have been forgotten on charge, 10 minutes in the case while getting ready provides a full day’s listening. Full case charge time is approximately 1.5 hours. Bluetooth 5.4 dual device connection means the earbuds stay paired to two devices simultaneously — a phone and a laptop, for example — and audio switches between them without manually disconnecting and reconnecting. The 47ms game mode reduces Bluetooth audio latency, which keeps sound effects synchronised with on-screen action in games and reduces the perceptible delay in video playback.

Right choice if you…

✔ Want dual-driver audio and strong ANC in the mid-range price bracket — hardware spec typically found at higher price points
✔ Use a OnePlus phone with OxygenOS 15+ — unlocks LHDC 5.0 Hi-Res, AI translation and full 400m range
✔ Need long battery with fast charging — 45hr total, 10min charge for 11hr playback covers any schedule
✔ Stay paired to phone and laptop simultaneously — dual device connection, no manual switching

Consider something else if…

✖ You use an iPhone as your primary device — LHDC 5.0 and AI features do not work on iOS; AAC codec and standard ANC/touch functions work fully, but the audio uplift from LHDC is not available
✖ You need wireless charging for the case — the Buds 4 case charges via USB-C only
✖ You need over-ear ANC for maximum noise isolation in loud environments — in-ear ANC supplements passive isolation; for maximum ANC in very loud spaces, an over-ear model delivers more total isolation

Technical Specifications

In the Box

Frequently Asked Questions

Do the OnePlus Buds 4 work with iPhone and Samsung?

Yes — the core functions work on any Bluetooth device. Audio playback, ANC, Transparency mode, touch controls, volume swipe, game mode and dual device connection all work on iPhone, Samsung Galaxy, and any other Bluetooth 5.x device. LHDC 5.0 Hi-Res codec and AI translation features require a compatible OnePlus phone running OxygenOS 15.0 or later. On all other devices, AAC codec is used — audio quality is still excellent from the dual-driver hardware, just without the Hi-Res uplift.

How does the dual driver setup improve sound over a single driver?

A single driver must reproduce the full frequency range — bass, midrange and treble — from one element. The 11mm woofer in the Buds 4 handles low and mid frequencies where a large driver moves more air for better bass extension, while the 6mm tweeter handles high frequencies where a small, lightweight driver responds faster for cleaner treble. Each driver has its own DAC, so the signal is split and converted independently before reaching each driver — reducing crosstalk and improving the separation between frequency bands. The result is cleaner bass that does not muddy the vocals, and treble that extends clearly without the harshness that a single driver pushed across all frequencies can produce.

How long does the 10-minute fast charge actually last?

OnePlus specifies 10 minutes in the case provides up to 11 hours of playback. This applies with ANC off and AAC codec. With ANC on, the same 10-minute charge provides proportionally less — approximately 6 hours based on the ANC-on battery ratio. The fast charge is from the case to the earbuds — the case itself must have charge available for this to work. A fully depleted case takes approximately 1.5 hours to charge via USB-C.

Does the charging case support wireless charging?

No — the Buds 4 case charges via USB-C only. Wireless charging is not supported on this model. For wireless case charging on OnePlus earbuds, check the OnePlus Buds Pro range which includes Qi wireless case charging on select models.

Condition

Brand New — Retail Packaging

Warranty

Manufacturer warranty (OnePlus)

Delivery

4–5 Working Days · Fully Tracked

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