Few questions about this watch

Hi all, I've just bought this watch two days ago and i have some question to be answer....
1. Is it nessesary to use a cuatom rom?
2. Besides the clock, what else can i do with tjis?
3. I have the one with leather, any of you use this under water?
4. What do i need on my pc, watch, phone to have a great user usage of my smartwatch?



Thanks for reading!!!!!!


P.S.: this is my watch

Enviado desde mi SM-T700 mediante Tapatalk