Palm-size, 2.3" x 4" x 1", dual channel unit contains the same diodes as used in Ion Pumping Cords. Device allows the use of any 3.5 mm jack alligator clip wires for Ion Pumping. Switches also allow for reversal of each channel - setting A results in a - black and + red clip; setting B results in a + black and - red clip. No battery required. Standard alligator clip wires (not included) are used with this unit and may be ordered separately.