I've been reading about these new heart rate/ oxygen/sleep monitoring wrist bands online, anyone have any suggestions on what works & what doesn't? My grandma has a leaking heart valve & when she sleeps, she exhales & doesn't inhale for a good minute or longer. I know that can't be good on her health. I'd like something that's • water resistant • good battery life • accurate • sleep tracker •heart rate/oxygen monitor • remote access to health stats • vibrates or lights up on incoming phone calls/texts (this is nice but not something she needs) and something that's simple & not bulky. With suggestions please list features so post is beneficial for anyone who comes across this question. Thank you!