The ABY is compatible with instruments, amplifiers, speakers (use speaker cable), and pedalboards. It features a mode-choosing switch that allows switching between A and B channels individually or simultaneously. In both modes, the ABY supports bidirectional signal flow, allowing the signal to travel from A/B to C, or from C to A/B. The ABY operates without a power supply (LED will not illuminate). Constructed with a full metal shell for durability and a solid feel. Compact and small design saves space on the pedalboard. True bypass switch design helps minimize tone loss. A/B Jack: Standard 1/4-inch Jack (MONO) Power Supply 1: DC 9V, 300mA Power Supply 2: USB 5V, 300mA Item Size: 90 x 48.5 x 42 mm / 3.54 x 1.91 x 1.65 in Item Weight: 178 g / 6.29 oz Color: Black Material: Aluminum Alloy Package Contents: 1 x ABY Channel Switch Note: Light reflection and display differences may cause slight variations in color. Measurement may vary by +/- 1-3 cm.