The LS-2 Line Selector Pedal from BOSS is a convenient way to switch settings among several effects devices or amplifiers, and route input and output signals. Two line loops with level control and six looping modes provide a wide variety of applications for your setups. In addition, the LS-2 Line Selector can also supply power to several BOSS compact pedals when used with an AC adapter (sold separately). A 9V battery is included.