I've used it once, but I'm selling it because I'm replacing it. It's a color and time setting that's currently unavailable on Amazon. Are you looking for a Pomodoro timer for studying or working? This is a hexagonal kitchen timer with a maximum timer function of 30 minutes. - Model Name: mooas Multi Hexagon Clock Timer - Color: White - Timer Setting: Up to 30 minutes - Design: Hexagonal Thank you for looking.