Mini Party Lites are a perfect way to brighten up any festive occasion by illuminating balloons from the inside, floral arrangements, centerpieces, place settings, and more! These lights are most effective in 11 inch or larger transparent and semi-transparent balloons filled with helium or air. Each unit is easy to activate with a simple twist and easy to install in a balloon with the elastic o-ring (provided). *Size: 1.25 x 0.5 inch *8 hour run time using 3 AG3 LR41 batteries (included & replaceable) *Steady On white LED light *Built-in loop for hanging *O-ring fastener makes balloon installation a snap