Let's use analogy. Think of it like tools used for meteorology. It helps detect changes in pressure, temperature, which may or may not predict a weather change. Let's say the devices may say that there are signs of an impeding tornado or hurricane so start preparing. It may happen or it may not happen--it's not a crystal ball. All the T series indicators measure various things like volatility, 52 week highs, etc. You can use one or combine them all together and see what works for you.