Another mentioned to others: "It's a shame the watch looks great but the pulse sensor doesn't work, watch is probably too thick, so no sleep data either." ...

Another warned fellow shoppers: "It's a shame the watch looks great but the pulse sensor doesn't work, watch is probably too thick, so no sleep data either." And a third customer noted that ...

Optical sensors, commonly used in wearable devices for pulse wave monitoring, face significant limitations such as dependency on sensor positioning and variations related to skin tone. To overcome ...