This large van de Graaff generator uniquely offers alternative drive modes, either hand-cranked or motor driven. Excellently constructed, the generator reliably delivers charge and sparks 10cm long and more immediately on setting it in motion, even under high humidity conditions. In hand-cranked mode the amount of charge generated can be seen to increase at higher cranking speeds, while the much faster motor-driven mode delivers a fast succession of sparks. The generator is 76cm high and features a 28cm diameter polished steel sphere, which is less vulnerable to dents and scratches than comparably sized aluminum spheres. A further unique feature of this generator is a built-in lamp close to the bottom of the belt that delivers a small amount of UV light when turned on. This can be seen to increase the charge production. A set of accessories is included, containing a discharge wand with a grounding cord, an electric plume, an electric whirl, a discharge bulb, a cord for connecting other electrostatic demonstration items, a spare charge belt and a spare motor drive belt. The generator measures 38cm x 23cm x 76cm.