This shows and labels the highs and lows from the previous 4h, daily, weekly, monthly, quarterly and yearly session. By default it only shows weekly, monthly and yearly. It also has an option to use small labels (M vs Monthly High) to save your eyeballs. You may need to adjust your charts right hand margin to see them properly.
Everything is shown in very tasteful shades of blue. For a faster loading version of this check my other indicators.