Give your students an incredible functional keepsake of their glow Prom or Homecoming theme with this Light-up Disco Sphere Tumbler. The unique 4 1/2" diameter 20 oz. sphere-shaped tumbler includes a hexagon-faceted exterior, screw-on lid, and flexible straw. Activate the flashing "disco" lights by pressing the button located at the bottom of the cup; choose a color change or blinking pattern. Comes with 3 red/blue/green color-changing bulbs and 2 non-replaceable CR1620 batteries. You can even customize this tumbler for your school event! Just add a one-color imprint on one side.