When they announced the feature of sharing your heartbeat with your partner via vibrate, both my girlfriend and I went 'eeeeew'. Some things shouldn't be done through technology, just like that Japanese remote kissing device :)
(There are optical heart rate sensors that are made for exercise, and they have much brighter LEDs and specially designed case for shutting out exterior light)
Where did they announce the brightness of the heart rate LEDs?
> specially designed case for shutting out exterior light
Well, it's sitting right against your wrist, pressed against it. I think that'll block out enough light.