The OnePlus Buds 4 are true wireless earbuds with an 11 mm woofer and a 6 mm tweeter in each earbud. They support adaptive noise cancellation and the LHDC 5.0 codec, and offer up to 45 hours of battery life with the charging case when ANC is off.
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Sound and supported codecs
Each earbud uses two drivers: an 11 mm woofer for bass and a 6 mm tweeter for treble. The stated frequency range is 15 to 40,000 Hz. Dividing frequencies between the drivers is part of the sound design, but the frequency range alone does not tell you everything about how the earbuds will sound.
The Buds 4 support SBC, AAC and LHDC 5.0 codecs. LHDC 5.0 enables high-quality wireless audio transmission, but using it also depends on support from the connected device. It is worth checking LHDC 5.0 compatibility on your phone or music player.
Noise cancellation and calls
Adaptive active noise cancellation (ANC) is rated at up to 55 dB. It can help when listening in noisy surroundings or while travelling, but “up to” does not mean it will eliminate every sound in every situation.
For calls, the earbuds use AI Clear Call technology and three microphones on each earbud. These are intended to help make your voice easier to understand, particularly when there is background noise.
Battery life and charging
With ANC on, the earbuds offer up to 6 hours on a single charge and up to 24 hours in total with the charging case. With ANC off, the stated total battery life with the case is up to 45 hours.
A 10-minute fast charge is said to provide approximately 3.5 hours of playback, which can be useful before heading out. Actual battery life can vary with use; the stated figures are maximums, not guarantees for every listening session.
Durability, connectivity and controls
The earbuds have an IP55 rating: they are protected against limited dust ingress and water jets. This can be useful during exercise or in light rain, but it does not mean they are completely dustproof or suitable for immersion. The rating applies to the earbuds; protection for the charging case is not specified.
Bluetooth 5.4 provides wireless connectivity to compatible devices. The earbuds also support connection to two devices at once, which can be convenient when using a phone and a computer. Gesture controls let you operate the earbuds without reaching for your phone every time.
The OnePlus Buds 4 combine dual drivers and LHDC 5.0 support with features such as ANC, dual-device connectivity and fast charging. When comparing battery life, it is important to distinguish between the earbuds’ standalone runtime and the total runtime with the case.
