The Radial BigShot ABY is an ultra compact, 100% passive foot switch that provides true bypass ABY amp switching capabilities with A or B toggle and A + B combine functionality. This assures the guitar signal is routed directly to the amp without any buffering, loading or tone altering circuits.To add versatility, the BigShot ABY has a built-in transformer that can be engaged to eliminate troublesome ground loops. Once on, you can also ensure your two amps are properly in phase using the 180º polarity reverse switch. The compact yet ultra rugged design makes the BigShot ABY ideal for pedalboard designs where space is always at a premium. Furthermore, because it does not require powering to make it work, it eliminates the need for batteries and space hungry power supplies.It also includes a tuner output, keeping it out of the main signal path. If you only need one amp, the BigShot ABY insteadworks as a mute switch so you can quietly tune.Any guitarist who needs a true-bypass amp switch with a light footprint and versatility can't be found without the Radial BigShot ABY!FeaturesTrue bypass ABY amp selector with tuner outOn-board transformer to eliminate ground buzz180° polarity reverse to phase-match ampsCompact and rugged for pedal boardsPlug and play easy to useSpecificationsAudio Circuit Type: Passive, true bypassFrequency Response: 20 Hz - 20 kHzGain: -0.3 dBConnectors:Input: 1/4"Output: 2 x 1/4" outputs, switchable transformer isolated from output BExtras: Tuner output, ISO switchConstruction: 14-gauge steelFinish: Durable powder coatPower: 9V DC, center pole negativeDimensions (H x W x D): 2" x 3.6" x 4"Weight: 1.25 lbs.Conditions: For use in dry locations only, 5-40°C Radial Engineering Bigshot ABY ABY Guitar Pedal.