To activate your Yellow LED Balloons, press the button located on the inside of the mouthpiece. Yellow LED Balloons remain 1 color when lit up & have 3 light functions with every click of the button: quick flash, slower flash & a no-flash steady light. NOTE: Before inflating, turn the LEDs on and pull the ribbon attached to the balloon until it’s unwound. Fill lit balloons with helium to maximum capacity for longest float time. For brightest results, use in the dark. Dimensions: Height: 15 in. Diameter: 8.75 in. Ribbon Length: 48 in. LED Colors: Yellow Balloon Color: Yellow Yellow LED Balloons come ready to use with non-replaceable batteries.