Close Bollinger bands crossover is a client-side VTL indicator. This indicator is based on Bollinger bands. The idea behind Bollinger bands is when the price is above the upper band, it is too high, and a mean reversion is expected. This indicator marks a red down arrow when the price closes above the upper Bollinger band. When the price close inside the Bollinger bands after closing above the upper band, it plots a green up arrow.