Electro-Harmonix Nano Switchblade Passive Channel Selector Enables switching between two amps, cabs or pedal boardsSmall die-cast case saves valuable pedal board spaceRugged construction The compact battery-operated channel switcher takes you back and forth between 2 different amps, cabinets, or pedal boards The ruggedly built EH Nano Switchblade is amazingly compact and will save you valuable pedal board space!Power your Switchblade stompbox with a 9V battery or an optional 9V 100ma tip-positive AC adapter with an 1/8" plug