EZBASICSAfro & Curls Shine in Spay, 236 ml

Can I leave this facial cleansing brush in the shower?

I do not see a green light at all when charging. I even turned off all the lights in the room to be sure. Where is the green light located?

What should I do if the blue light for cold mode stays on, but nothing happens? Nothing actually works, is just the blue light kept on

I did not get an instruction booklet with this item. Where can I get one?