Each year, hundreds of millions of songbirds perish as a result of window strikes in America. Now, you can be part of the solution. After two years of chemical engineering, WindowAlert announces the ultimate product--UV Liquid. UV Liquid is designed to fill in the gaps between our decals on windows--providing complete window protection. WindowAlert decals catch the attention of birds. UV Liquid completes the visual barrier. UV Liquid is easy to apply. Simply use our bingo marker to make dots on window glass. The dots dry to virtually clear, last three months, and are easy to remove. And, they save songbirds!