This is an excellent low cost flanger pedal influenced by the vintage Boss BF-2 which gives that distinct "Jet Plane" sound. Not only is it available at a great price, it's true bypass and takes up a really small space on your pedal board measuring just 9x3.5x5.5cm. There are loads of ways to change the type of flanger sound by use of the "Depth", "Res", "Rate" and "Manual" controls. Changing these settings can make your sound vary from a slight barely noticeable flange sound, to more of an obvious and experimental effect. The ENO flanger takes a standard 9v adaptor, however because of its tiny size, it can't actually fit a 9V battery in it. So an adaptor is essential.