Samsung Galaxy Watch 8 40mm

Design & Build

The Galaxy Watch 8 in 40 mm features a refined cushion (“squircle”) design made from Armor Aluminum 2, measuring just 8.6 mm thick and weighing around 34 g—11% slimmer than the Galaxy Watch 7 44 mm model, enhancing everyday wear comfort and improving light visibility with a peak brightness of 3,000 nits on sapphire‑crystal Super AMOLED display (1.47″, 480 × 480 px) . Durability is solidified with 5 ATM + IP68 water resistance and MIL‑STD‑810H certification

 Performance & Battery

Powered by the Exynos W1000 (5‑core, 3 nm) chip, paired with 2 GB RAM and 32 GB storage, the Watch 8 delivers fast wear‑level performance on Wear OS 6 with One UI Watch 8, including four years of update support through 2029 . At its core is a 435 mAh battery, supporting fast wireless (WPC-based) charging, and offering up to 30 hours with AOD enabled under typical usage .

AI Integration & Software

This model is notably the first smartwatch to ship with Google’s Gemini AI built-in, enabling voice-powered commands (text reply, search, workouts, reminders) directly on the watch over Wi‑Fi or LTE—even independently of a phone . The UI includes a streamlined Now Bar, multi‑info tiles, and enhanced background activity tracking .

Health & Wellness Features

Equipped with Samsung’s BioActive Sensor suite (heart rate, ECG, SpO₂, BIA analysis), skin temperature, barometer, light, and motion sensors, this watch supports a broad health and fitness set. Key features include:

• AI Running Coach: Establishes training plans based on a 12-minute fitness test and dual-frequency GPS .

• Vascular Load & Antioxidant Index: Cardiovascular strain tracking and a quick LED‑based skin test (though accuracy is still debated) .

• Sleep Suite Enhancements: Circadian guidance, sleep‑apnea detection (FDA‑approved in UK/EU), stress alerts, energy scoring, mindfulness tools, and menstrual tracking via skin temperature sensing

Wired notes the health features are substantial, though metrics like the antioxidant index lack context for many users

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