- Boss GKC-AD GK Converter; Converts analog 13-pin GK pickup systems to the newly developed Serial GK digital interface; allows you to drive the Serial GK input on BOSS guitar synthesizer products using the Serial GK Interface from a Roland GK-3 or GK-3B Divided Pickup or an instrument equipped with a 13-pin GK output; Instrument output for passing normal guitar/bass pickup sounds embedded in the 13-pin connection; Power Supply connector: Barrel Connector 5.5 x 2.1 mm, center negative; Current Draw:240 mA; powered by a DC Power Supply (included); Dimensions: (W x D x H): 115 x 92 x 36 mm (4,53" x 3,63" x 1,44"); Weight: 340 g (0,75 lbs)