I originally bought the blue non-fast charge version which worked great. I saw some additions to the red version and I should have had them. You can use it as a passthrough device and see how many amps the device draws from USB alone, which is pretty cool. 4 ways to eat! Plug it directly into a USB port anywhere, disconnect from Micro-USB or USB-c, or even solder wires to a +/- USB connector. Just such a cool thing for small electronic projects. I wanted to drop the voltage on a small 12 volt lightbulb to see what volts give it a nice dark look and it was very easy. It couldn't power it with 12V as it was over 15W, but I didn't try that anyway. So this thing can even switch to fast charging modes for phones. It's cool too. I think the red (1-30v) is a bit more versatile than the first blue I got. I can't think of anything that only requires 0.5V, but it's there just in case. The exit tabs are just spring loaded so you can push in and tuck the wire etc in and release. I hesitated a second before looking closer. It's worth nothing.
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