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How is it possible to regulate engine speed, light and temperature for so little money with one device? Possible. How??? PWM controller that can be found on Chinese websites for under one euro plus shipping. Very simple even for the most layman. Connect the power supply and the device is ready. See how in the video titled: UNBELIEVABLE! Regulate engine speed, light and temperature for 1 Euro. Links: https://de.aliexpress.com/item/100500... Two-way https://de.aliexpress.com/item/100500...