The second number 2 sets the standard deviation multiplier for the upper and lower bands. They are most likely part of a bigger degree corrective wave, like a zigzag or a zigzag family pattern.
Often times such supplements(like ones sold at WalMart) only contain 20 or less HCA- even when they are marked as higher(this was the conclusion of a recent study). Such low-grade products(like the ones from GNC usually) are basically scams, replete with fillers and additives and dont do much to give you the true benefits of the natural extract. One of the biggest advantages of GC is its ability to prevent carbs from becoming fatty acids once inside the body- which is a result of the HCAs effects.