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Battery life varies widely across the listings. Examples shown include "168 hours," "3 Days," "36 Hours," and shorter spans such as "18 Hours," so expect durations from under a day up to multiple days depending on the model and usage.

Listings show band materials such as silicone and fluoroelastomer. Several descriptions note interchangeable or changeable bands; in some cases bands are sold separately.

The listings include a mix of screen diagonals and case diameters. Examples shown are 2.01-inch and 1.36-inch displays, and case/screen diameters listed as 40 mm, 42 mm, 44 mm, and 46 mm across different models.

Product details show a range of ratings: IP68 and IP6X, some models state 5 ATM or 50 meters of water resistance, and a rugged model lists 100 m water resistance.

Across the listings you'll find heart-rate and ECG/heart-rhythm monitoring, blood oxygen (SpO2), sleep metrics (duration, quality, and stages on some models), calories, steps/distance, respiratory rate, stress level, menstrual/ovulation tracking, body temperature, and body-composition metrics on some devices.