DROK 9V Voltage Regulator, DC Buck Converter 5V-23V 12V to 0.01-18V 5V Power Supply Step Down Transformer Module, 3A LCD Volt Stabilizer Circuit Board is a versatile and powerful voltage regulator that can be used in a variety of applications. It features a wide input voltage range of 5V-23V, an adjustable output voltage from 0.01V to 18V, and a peak output current of 3A, making it suitable for powering a wide range of devices. The voltage regulator also features an LCD display that shows the output voltage and current, making it easy to monitor the performance of the device.