1. There is selling climax at number 1 on the chart, small investors, for fear of strong declines, sell their stocks. During this, large investors started the buying process.
2. There is a large volume on the downward wave, but the price does not move lower, it means that while one side of the market was selling their stocks intensively - the other side of the market bought them.
3. The price has moved below the minimum level of selling climax, it was a controlled check by large investors - is there still a large supply on the market. The low volume means that the supply was mostly bought.
Summary
If the price is above the consolidation channel - it is worth to buy stocks at a correct.
Important: The breakthrough of the upper level of consolidation should take place at the increased volume.