The OnePlus Watch 4 is here, and it looks like the company is going all in on the premium stuff this time. You get an all-titanium alloy case, sapphire crystal glass, a big 646mAh battery, Wear OS 6 and a display that can hit a claimed 3000 nits in sports mode when you’re out in strong sunlight.
A stronger push on materials and durability
OnePlus is clearly trying to make this feel like a proper premium watch, not just another standard smartwatch with a round screen. The Watch 4 comes with a titanium alloy body, sapphire crystal glass on top and a fiberglass-reinforced bottom case. It measures 47.4 x 47.4 x 11.0 mm, weighs about 43g for the main body and around 68g once you add the strap.
You get two versions, Midnight Titanium and Evergreen Titanium. Midnight Titanium uses a fluororubber strap, while Evergreen Titanium gets a mixed fluororubber strap. Both are aimed more at the premium end of the market rather than the usual lightweight sports watch look.
It is also built to handle a bit more abuse. There is 5 ATM water resistance, IP68 and IP69 protection, plus MIL-STD-810H military-grade certification. That gives it a much tougher profile than the average Wear OS watch.
Display gets a serious brightness boost
The Watch 4 uses an LTPO OLED flexible display with 466 x 466 resolution and 310 PPI. The default maximum brightness is rated at 600 nits, rising to 1500 nits in strong sunlight.
The standout figure is the claimed 3000 nits peak brightness, which activates in OnePlus’s own sports modes under strong sunlight. That is a high number for a smartwatch and should make outdoor workouts much easier to follow, especially for runners and cyclists training in direct sun.
The hardware underneath also stays in flagship territory. OnePlus uses the Qualcomm Snapdragon W5 processor alongside the BES 2800 co-processor, with 2GB of RAM and 32GB of storage.
Battery life and software look stronger than expected
Battery life is rated at up to 16 days in power saver mode, five days in smart mode and three days under heavy use. Charging takes around 75 minutes, with support for up to 7.5W charging.
That battery setup should help the Watch 4 stand apart from many Wear OS rivals, where endurance is often the weakest point. It is still a full smartwatch, but OnePlus is clearly trying to reduce the usual charging fatigue.
Another detail worth noting is the software. The watch runs OxygenOS Watch 8 with Wear OS 6.0, which is more important than some earlier leaks suggested. Some reports expected Wear OS 5, so shipping with version 6 gives it a stronger launch position.
There is Bluetooth 5.2, dual-band L1 and L5 GPS support, Wi-Fi on both 2.4GHz and 5GHz, NFC and Google Wallet support. eSIM is missing, though, which will disappoint some buyers expecting full standalone connectivity.
Health tracking gets the usual OnePlus package
OnePlus includes optical heart rate tracking, blood oxygen monitoring, wrist temperature tracking, sleep analysis and the 60-second Wellness Overview feature. There is also ECG support, although availability depends on local certification.
Fall detection and Emergency Rescue are included, along with health trend insights, relaxation tools, cycle tracking and sedentary reminders. The watch also tracks high and low heart rate alerts, resting heart rate and sleep benchmark heart rate.
Fitness support covers more than 100 sports modes, with deeper metrics for activities like running, skiing, tennis, badminton and swimming. There is also track running mode, aerobic training effect, cardiopulmonary capacity, recovery time and heart rate recovery rate.
Our takeaway
Taken as a whole, the OnePlus Watch 4 does not bring major new features or a big redesign. It sticks closely to the same formula, but improves the overall package with better materials, stronger durability, a brighter display and solid battery life.
Titanium, sapphire crystal, dual-band GPS and Wear OS 6 help it feel more polished and more premium, even if the overall experience will be familiar to anyone coming from the previous generation. OnePlus has not shared pricing details yet, but the watch is already listed on the company’s website.
In our review, the OnePlus Watch 3 stood out for getting the basics right. Battery life is one of the strongest points, easily lasting longer than most Wear OS rivals, while the dual-chip setup helping keep performance smooth without constant charging stress. The display is bright, health tracking was reliable and the overall build felt properly premium. It was not perfect, especially with some software quirks and the usual Wear OS limitations, but it felt like one of the more balanced Android smartwatches available.
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