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

Works great with my Anker 21w solar panel and boosts the voltage to 7v to run my Guide 10 Plus charger from the solar port (higher power and faster charging time than USB input). I like that it maintains the output voltage when it's a little cloudy. It lowers the input voltage to around 3.5 volts, but supports 7 volts very well. (of course with less power). I had to purchase a 2.5mm USB adapter ($3.99) which I cut in half for the input and output jacks for any device with a DROK amp in the middle. Good quality small DC/DC booster.