The Bolliger Band s On-Off let you control the indicator using the keyboard or a button. The Bollinger Bands
identify the degree of real-time volatility for a financial instruments. A lower amplitude corresponds to a
low volatility, conversely a greater bandwidth corresponds to high volatility

How it works: you can choose if you want the indicator always shown or always hided
while switching among different time frames or financial instruments. Starting from this initial condition it’s
possible to
show/hide  the indicator just pressing the button or using the keyboard.

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The Bollinger Bands indicator is composed by
three  lines: the
upper  and
lower  band and a
simple moving average. The upper and lower band are obtained respectively by adding and subtracting the standard deviation
from the moving average N (default=2) times. The central band is given by the moving average that has 20-periods as default.

Upper Band= SMA 2Sdt

Middle Band= SMA

Lower Band= SMA-2Sdt

• It is possible to setup the period, the shift and the type of average to calculate the median
  band 
• You can choose their color, the style  and the the width
• It is possible to shut down the button and setup your favorite keys to on-off the indicator
• It is possible to customize the button: the position on the screen, the size, the colors
  and the label

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