Feature: 1. 2 CAPACITORS: Connect the conductive layers outside the two capacitors with connecting pieces, resulting in a brighter discharge spark and a longer time interval between two discharges. 2. HAND OPERATED: The electrostatic induction motor is controlled by a hand crank handle to ensure optimal performance. 3. INTUITIVE OBSERVATION: Observing in a dark room is more intuitive, the discharge effect can be clearly seen on the needle tip of the collecting rod. 4. SMALL CURRENT: Adjusting the position of the discharge ball may cause an electric shock, but do not worry, although the voltage can achieve tens of thousands of volts, the current is very small. 5. EASY TO USE: After use, the two discharge balls can be in contact to neutralize the positive and negative charges. Specification: Item Type: Electrostatic Induction Motor Material: PVC Environmental Temperature: -2℃ to 40℃ Spark Discharge Distance: ≥55MM in an environment with a relative humidity of 65%; ≥30MM under conditions of relative humidity less than 80%. Package List: 1 x Electrostatic Induction Motor1 x Handle1 x Instruction Manual