The OnePlus Buds 3 use an in-ear fit and are fully true wireless, with no cables or neckband connecting the two earbuds. They weigh 9.6 g and carry an IP55 rating, meaning they are resistant to both water and dust. Stereo speakers are built in, while wingtips, RGB lighting, a UV light, and a display are all absent from the design.
The OnePlus Buds 3 feature both active noise cancellation and passive noise reduction, giving them a dual approach to blocking out unwanted sound. Each earbud uses an 11 mm driver unit with a neodymium magnet, operating at 16 Ohms impedance and covering a frequency range of 15 Hz to 40,000 Hz. Spatial audio is supported, while Dolby Atmos and Dirac Virtuo are not available on this model.
Each earbud holds a 58 mAh rechargeable battery, delivering up to 10 hours of playback or 6.5 hours with ANC enabled, and the 520 mAh charging case extends total battery life to 34 hours. A full charge takes 1.5 hours, and a battery level indicator is included to keep track of remaining power. Wireless charging and solar charging are not supported, so the case must be charged via a wired connection.
The OnePlus Buds 3 connect wirelessly via Bluetooth 5.3 with a maximum range of 10 m, and support both AAC and LDHC codecs for audio transmission. Fast pairing is available, while NFC pairing, Bluetooth LE Audio, and Auracast are not supported. The aptX family of codecs — including aptX, aptX HD, aptX Adaptive, aptX Low Latency, aptX Lossless, and aptX Voice — is also absent. Audio latency is rated at 94 ms, and the charging case uses USB-C for wired charging.
The OnePlus Buds 3 include a solid set of practical features, among them ambient sound mode, in/on-ear detection for automatic playback pause, a mute function, and voice prompts for audio feedback. Fast charging is supported, and the earbuds can connect to two devices simultaneously via multipoint pairing. A find device feature helps locate misplaced earbuds, and controls are handled through an on-device panel rather than an in-line remote. The buds can function as a headset for calls, and a travel bag is included in the box. Notification readout, a temperature sensor, and a camera remote function are not available, and the product comes with a 1-year warranty.
The OnePlus Buds 3 are equipped with a six-microphone array that includes noise cancellation, designed to reduce background noise during calls. The microphones have a sensitivity rating of -38dBV/Pa, which reflects their ability to pick up sound at a given input level.