I polled the Amazon community TWICE about instructions for this device, and didn"t get a single answer. I was surprised to get not one reply. Why is that relevant to the review? Because the device comes with absolutely zero instructions and the DROK website/blog is useless. They will only offer you a "spec sheet" which tells you absolutely nothing about how to operate the device. Again, I asked EVERYONE on Amazon who bought one of these for instructions and got nothing. So only by a stroke of luck did I get an email from DROK asking me how my purchase was, and would I kindly leave a 5-star review if I was happy? I replied to them and said I will do no such thing until someone provides me some instructions. Lo and behold, a few minutes later, I received a reply with instructions attached.

**edit** I attached pictures of the purpose of this device - powering LEDs on an R/C truck

Understand that you must be fluent in Chinglish to understand said instructions, and they only give you an idea on how to operate the device. I actually stumbled upon it while frantically pushing buttons and turning screws. Now the device puts out a steady 3.3V to drive the LED lights I"m mounting on my Tamiya Blackfoot.

Only purchase if you"re the persistent type.

DROK products are very reliable and great for all kinds of projects from RC to IT and every other electronic projects needing odd voltage requirements! I will keep doing business with them!

Excellent product, works as advertised quality, timely shipping, couldn't ask for better. I use it to regulate the voltage to my Meade 10 inch classic lx200 telescope. Perfect for the job.

works good and just what I neeeded

Amazing!!! This device not only converted DC voltage it converted me. Now i'm saved. Halleluja!!