This indicator works similar to the Tightened Bollinger Band (TBB) Strategy. Normally, when bollinger bands tighten, you look for the point where they widen and the direction of the price is often a breakout.
This indicator does the something similar, but using MACD, so you get other opportunities to get into plays. When the bollinger bands on the indicator tighten, wait for them to widen. The MACD line will turn red. The exit to the play is when the macd pulls away from the band and turns black again.
This indicator was built to help with some instructional material presented at optionsplayers.com
Let me know if you like the indicator or have any suggestions!