From Boss:

The LS-2 Line Selector pedal represents the easy way to switch settings among several effects devices or amplifiers, or route input and output signals. Two line loops and six looping modes provide a wide variety of applications.

• Compact line selection pedal for connecting and switching between multiple amplifiers and effects devices
• Provides two line loops with Level control and six looping modes
• Can supply power to several BOSS compact pedals when used with an AC adaptor
• The ideal power supply and master switching unit for multiple effects setups
• BOSS 5-year warranty