a. Can I see my heart rate continuously with the watch? (i.e. with the display constantly switched on) b. Can I use the watch with an iPad, or does it HAVE to be an iPhone? c. How long does the watch run with the display constantly switched on? d. What information is displayed about sleep: pulse, sleep, REM, deep light sleep? HRV? Readiness (like the Oura Ring)? e. Are there any plans where you have to buy to use all the functions?