amiciSmart Buck Boost Converter Display, Buck-Boost Board DC 5-30V to DC 0.6-30V Adjustable Constant Current Voltage Step UP Down Voltage Regulator 4A 35W Power Supply Module

Item worked very well. I ordered single quantity at first to get a hold of the item quality. Then I re-order 2 more as the product worked beyond my expectation. There are one output and one input. One blue LED display board. A heat-sink is also provided with thermal sticker. The product has 2 screws which can be turned to control the output voltage and current. They are labelled as cv (Constant voltage) and cc(Constant current). The output voltage can be varied between 5.5v to 30v by rotating the appropriate screw. U can use the board without the heatsink uptill 15v output. Beyond that Heat-sink usage is must as the circuitry becomes quiet hot (60-70degree). It provides a near constant voltage with a fluctuation of 0.01v as measured with a multimeter. The output max ampere can also be varied by rotating the cc screw. The LED panel displays real-time input/output voltage and current. The display mode needs to be switched between output and input through a small press switch near the display. In a word , highly satisfied with the product.

This is good but wall is low

Despite of having a good input getting nothing from output, does not matter how much or which pot you turn. It is a piece of chinese junk. No quality control at all. Edit: After contacting seller, seller was nice and kind enough troubleshoot my problem. My input voltage was 0.5V less than the required voltage that you can see in the video which was the cause of the problem. As a buck converter you can draw 25W continiously provided you have attached heat sink and a cooling fan. Dont expect anything more than that.

Product working well ease to use however price is little higher side but best build quality

When pressed both the buttons together for around 10sec display went into testing mode and stuck into that mode had no option and also nowhere mentioned about this so returned back If you want to buy this you can it's pretty good and does the job pretty well but care full don't press the buttons together if you get the way to switch back to normal mode than share it would be helpful

Best for bettery charging.

Amazing product. It's quite precise and extremely useful voltage regulator. I used it to make a mini UPS for my internet modem which used to restart everytime there was a fluctuation or power disruption thereby wasting precious 15 minutes by the time the connection used to re-establish. It has proven extremely useful as a variable voltage battery Bank and a variable dc voltage source. I thank the Amici team and Amazon for quick delivery and prompt response with any questions or concerns. I definitely recommend the seller and the product. In fact, I'll be buying 3 more of the same product asap. Kudos to the Amici team and Amazon. 5 stars.

Not accurate in reading