The RSI buy/sell signal

As part of the Simple Approach series I do, I came across a chart of $ININ today and thought it would be a good example of how to use RSI for a Buy or Sell signal. Below is a Daily chart showing several dips below RSI 50 that were met with buyers quickly:

ININCurrently RSI is above 70 (4th time touched on this chart) and has been a nice RSI sell signal in the past. Worth eyeing if no position.