Shanghai Stock Exchange "Weekly" chart using the Keltner Channels.
1) I prefer using Keltner than Bollinger ; Crossover method is more reliable
2) Three conditions ; see three colours on the chart
3) Condition "1" ; simple crossover 4 and 40 weekly exp moving average
4) Condition "2" ; crossover occurs below the lower band ; allows trader to use the crossover level as a stop loss level. (in this case the stop stands @ 2513.
5) Condition "3" ; allows you to "book" profits and use the crossover as a short trigger (using the crossover level as your stop).
6) Shanghai index stands @ 2652, main resistance stands @ 2750
