1.Input accepts 1/0 or 4 gauge wire, Outputs accepts 4 or 8 gauge wire, include 1 x 2GA, 2 x 4GA, 2 x 8GA Out. Come with 2 pieces car amplifier power distribution, make wiring your system easier with distribution blocks. 2.Designed for: 3 way power distributor, designed for high performance by the industry experts, provides complete for your car's audio system. The 3-way power distribution block allows you to connect as many as three amplifiers to a single power source. 3.Good Helper: The main input allows you to connect 4 or 1/0 gauge wires from the battery to the module, and up to three 4 or 8 gauge wires to the amplifier. 4.Practical Accessory: This article can also be used to combine the ground wires of multiple amplifiers to a single grounding point. You also need to place a in line between the distribution block and the amplifier. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.