Backside of the 255

5858725 1 day ago

Hi, question on the backside of the 255, what are the four rectangular parts around the two squared green light sensors ?

I understood the two green light are the sensors mesuring the heart beat frequency, but green light is sometime continuous, sometime intermittent.... what's the difference?

In the user manual there's no indication and I am so curious! sorry!

Thank you

Top Replies

Bitti 1 day ago +1

The green lights are just that: led lights, they don't sense anything. The four squares around them are the light sensors measuring reflected light. (And the lights are red during oxygen saturation measurement…

All Replies

0 Bitti 1 day ago

The green lights are just that: led lights, they don't sense anything. The four squares around them are the light sensors measuring reflected light. (And the lights are red during oxygen saturation measurement.)

When not in activity, readings are only taken periodically, not constantly, to save battery. That's why the lights blink.

0 5858725 1 day ago in reply to Bitti

Thank you for your reply, very clear. And as far as I have tryed, it's not possible to avoid measurements of heart frequency off the activities.. I wonder if there's a way to allow the measurements only during activities but it seems not. This is just to save battery (if I am working sitting on a chair why should I monitor the heart frequency?)

Do you agree?

Thanks!

0 ovekvam 23 hours ago in reply to 5858725

Some of the features of the watch that evaluates your shape, body battery, restitution and training effect rely on heart rate measurements outside your activities.

0 5858725 20 hours ago in reply to ovekvam

Understood! thank you for the explanation.