These hand held devices became popular worldwide in the late 1990s. A US Patent was awarded to Taiwanese inventor Tsao-i-Shih in 1996 for this device.
The handle contains batteries and a charging mechanism that generates high voltage. The circuit is composed of an electronic oscillator, a step-up transformer and a voltage multiplier, similar to the circuit in an electroshock weapon or a stun gun, but with much lower power. What device?

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