Review on RioRand 5 Pack Boost Converter Module: XL6009 DC 3.0-30 V to DC 5-35 V, Adjustable Output Voltage, Step up Circuit Board - 4A by Thomas Ramirez

The only reason I didn't give it 5 stars was because I had to re-solder the potentiometer on one of the five items I received. This was a quick fix, but it took a lot of troubleshooting to figure it out. These regulators are good for the price and work very well even at very low voltage (5.0 to 8.4 volts). They are easily adjustable to hundredths of a volt at 8.4 volts and easily adjustable to tenths of a volt above 12 volts. All my voltage tests were done at 2.0 amps and below. The lowest efficiency in my tests was 72% at 5 volts, and the highest efficiency I tested was 89% at 30 volts. They work well for a very cheap device. I have used this model in a variable voltage vape box mod and would recommend it to anyone who needs low amp voltage regulation. Actual size is 2.3 inches by 1.1 inches by 0.7 inches.