Pinwheels or 'Wartenburg Wheels' were originally a medical device designed to examine nerve response. E-Stim's electronic pinwheels test more than just simple nerve response.

This version with a single pinwheel is a unipolar electrode, so it needs to be used in conjunction with another electrode. It features a insulated handle and a durable 4 mm socket, while bipolar electric pinwheels have been described by some as 'just bad.'

The spiked wheel stimulates the skin as current flows, producing an incredible sensation. To enhance pleasure, greater pressure does not need to be applied, just an increase in intensity.

As this is a unipolar device, it should be used in conjunction with another electrode, and care should be taken to ensure that the current does not pass diagonally or through the chest.