MEDIUM-DUTY 2A Output. Designed for use with our battery eliminator kits that use 2 through 8 alkaline batteries (AAA, AA, C, D) or a single 9V alkaline battery. This MEDIUM-DUTY 2A OUTPUT AC to DC wall power adapter plugs into a standard wall outlet and converts 100VAC-240VAC to an adjustable output voltage of 3VDC, 4.5VDC, 5.0VDC, 6VDC, 7.5VDC, 9.0VDC and 12VDC @ 2A. Comes with a 6-ft long power cable with a 5.5mm x 2.1mm barrel plug connector at the end. The output voltage can be adjusted with the included key or a small screwdriver by rotating the red selector knob, on the adapter's housing, to the desired output voltage.