XFXEA calculates an entry point by evaluating a certain number of bars in a unique way and then forms a critical range. Based on this range, determines how and when to start trading.
All this is done without using the principle of Martingale.
As the name suggests, Forex Combo System is a collection of several subsystems, four to be clear. The most accurate description that fits it is "four different EAs joined together". The result of such an EA could be considered "Pleasant" as you will discover this yourself after some further reading, It's an easy-to-use EA and is one of the most solid automated trading systems that I've ever seen.