This portable desktop plasma orb provides hands-on experience with light, electricity, and energy. A small Tesla coil generates a large electrical potential difference, which tries to even itself out by discharging in the same way that a cloud discharges lightning. Touch the glass ball to generate and control concentrated plasma streams with just your fingers. Features an on/off switch and requires 4 AAA batteries (not included) or an AC adaptor (also not included). The plasma orb is great for use at home, work, or in the classroom.