A traditional MACD, with Histogram. But that is not all to it! 

This MACD indicator, draws divergences not only on MACD line (optional) but also on histogram (optional). Again, that is not all to it!

The biggest issue with MACD crossing signal system, is that when MACD moves toward the zero zone, it will constantly cross and give false signals, even if you add a higher time frame to filter out these signals, still you will get more than enough false signals to screw your trading.

Some people add another type of indicator to the whole system, like trend lines, moving averages, etc. But they are not necessary. If you know, as any other statistical, mathematical calculation, there are zones in MACD that can be used for false signal filtering. How ever, the problem with MACD is the formula itself. Unlike RSI or Stochastic, there is no UPPER BOUND or LOWER BOUND for this indicator, so, normally you can't assign a zone for upper and lower signal validation.

Again, knowing statistics and math, you can DEFINE a dynamic zone for these type of indicators. Even for those who are bounded to upper and lower limit, having a dynamic zone is much better approach compared to solid non-dynamic numbers.

Why is it better?

Think about charts and markets. They have sharp moves, not so sharp but trending moves, and then.... choppiness and side-way moves. A solid, rigid zone won't be good for ALL these cases. But a dynamic, mathematically calculated zone, can be used simply because it will adjust itself based on the conditions in the market.

For the best usage, We recommend you have more than one time frame with this indicator on them. When a lower time frame has a cross inside a zone or beyond the zone area, check the higher time frame, the least you would want to see, is the MACD entering it's zone proper to the signal, but on higher time frame.