The redesigned sensor array on the back of the Watch 4 looks sharp, and combines the electrical ECG sensor from previous watches, plus optical heart rate and a new impedance-based electrical sensor. It’s pretty to look at. It also feels less bulky than previous watches did.
Two side buttons bring up Samsung Pay (or Google Pay) when long-pressed, and Samsung Bixby for voice assistant stuff. Yes, Bixby. More on that below. The buttons can be single-pressed or double-pressed for other home/back navigation, and can be assigned a few other limited actions in the Samsung Wear app that’s needed to pair the watches to your phone.
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