Review on DROK 300001 Micro LED DC-DC Digital Boost Voltage Converter Adjustable Volt Regulator Board Module Power Supply Transformer by Micheal Wright

I've had one since 2015 and use it often. It works, is stable and very practical. I would give it five stars but the built in voltmeter does not correspond to about 0.5 volts output. It's easy enough to check the voltages with another multimeter, and that doesn't detract from its usefulness. Edit: Oh one more thing. According to the product description, the device has green and red LEDs. I have two red ones. The LED closest to the display is the input and the other is the output.