A:AnswerIf your ring doesn’t fit snuggly on your finger that could be why, the sensors may not be in the correct position while you are sleeping. I got my ring so it fits two fingers as when it’s hot my fingers swell a little bit so when I’m sleeping I put it on the finger it fits snuggly on so that it can’t spin around as much, but I’ve also had it not track and hour or so of sleep for a couple of nights and usually in the early morning and when I look it’s because my ring is twisted to where the sensors are on top of my finger.
A:AnswerYes it has the base the ring sets on to charge as well as a cord but it’s doesn’t come with a wall plug. So you’ll need a usb-c block to plug it in if you don’t have one.
A:AnswerEasiest way to solve this would be to buy the $10 sizing kit. When we bought the kit, they handed us a $10 gift card, which then cancelled out the price of the ring. This made sure we got the right size ahead of time and didn't need to worry about any exchanges.