Includes energizer/amp, power, and RCA cable. This is a balanced, tube driven energizer that will run two sets of cans at the same time. Please note this will not run standard headphones. You need electrostats compatible with the plugs on this unit. Puts out the same power to two earspeaker outputs so great for A/B testing, which was it's primary use in my care. I also enjoyed using it as a pre amp for other equipment.