The intelligent reminder sticker turns on when pull out the insulation sheet; Uses the 3M adhesive tape to stick the reminder sticker on the cup surface; If you pick up the water cup in power off state the reminder sticker will light(green light) with buzz and turn on automatically; In normal working state the reminder sticker will light(green light) every more than 10 seconds; In normal working state if without drinking water over 30 minutes it will buzz and light(red light) each 3 minutes during the first 15 minutes; In the following time the buzzer will buzz and light(red light) each 10 minutes; Auto turn off if not drinking water over 120 minutes; With adjustable volume convenient to use; Water resistant design suitable for daily life but not for diving sports.