双布林线2c趋势 (Double Bollinger 2 c trend)

In BB priceline goes from one side to another and sometimes only to the middle line and then back.
in this system the second bb makes a little easier to see when the trend will change.
also very strong signals are when priceline is outside of both BBs.
I advise it to use on 15min up.

settings
BB 1 - 20, 1
BB 2 - 5, 1

You can read on any site some more rules on BB.
here the stochastic (3, 3, 50) helps also to see trend changing.
When the BBs are very narrow the best is not to trade.
At that time it is not sure where the price will go up or down. It is a time of indecision.