I'm considering in buying either a Instinct Solar, Vivoactive 4 or a Fenix 6 Pro. Currently coming from a vivosmart4, all other three devices a devinitly an upgrade.
How long does the vivoactive 4 pulse-ox tracking work during sleep? Does it record the whole sleepiing period?
Does it even have 24/7 measuring and if so, it it working properly?