Behringer AB200 Dual A/B Switch Ultra-compact and universal 2-channel footswitch for stage and studio applications Usable for all products with external control functions such as guitar amps, keyboards, rhythm machines, lighting products, etc. Easily switch between two input signals into one output or vice versa (e. g. switch between two guitars using one amplifier or two amplifiers with one guitar) Relay switching technology for ultra-high impedance and signal integrity Combine multiple AB200's together by using the side-mount interlock