Disclaimer - There is no such thing as return without risk, the risk and reward are bound together with an eternal bond.
A pennant pattern is similar to flag where after a steep movement with increased volume, the stock consolidates in a small triangular format where the volume decreases significantly, and after the breakout with volume the stock moves in the similar direction, and the move is at least equal to to previous move made by the stock. There is a similar pattern formed in WIPRO today -