Case 1) Simply type! You'll get some suggestions while typing.
Case 2) Click with your mouse, obviously.
Case 3) Use Down (Right) or Up (Left) key to move among options.
The color spectrum shows correspondence between color and price. Each option is given a color from the spectrum which represents its average price relative to other options.
Font size of each option represents number of found offers relative to other options. That is, bigger option means more found offers, which somehow means it's a popular option.
Case 1) Click on any pre-defined range.
Case 2) Drag the bottom slider to customize a range.
Case 3) A single value is also accepted by typing!
