I've bought the stock so far. High quality components. Definitely worth $18. This thing can also directly charge batteries with constant current and constant voltage. nothing to think about Just set the amp value and voltage, connect the battery and turn on the unit. As a desktop source, I couldn't be happier. I like looking around and seeing how much current is being drawn. Good product. Stick with DROK as they are a genuine brand that make their own hardware. Unlike other items I've seen such as the "BOBS Pro Micro", the Arduino Pro Micro sold by Bob.
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