If you like cool new products that promote health and wellness . . . your going to love this one! This is an awesome water bottle accessory device that clips on any standard water bottle or eco friendly container (with a diameter of 2.5" to 3"). It helps remind individuals to keep track of their water intake on a daily basis. It requires NO battery chargers or Apps. You just clip it on to your preferred container starting at #1. When you are done chugging your water, you fill the container up again, and move the notch to #2. Repeat until you reach #8. Your done for the day. It's that easy. Drink 8 feel great!Tri-More