The charger function works fine. It's easy to use. amp control is accurate. Fast shipping. Recomend.
16 days to Spain. Works great connected to a 5V powerbank. The potentiometer is precise and it is easy to adjust your desired voltage and current output. 4W out and it will get a little warm without the heat sink heat, but you get one if you need it. If you short circuit the output without load it shuts off and turns off if you remove the short circuit. Comes with a electrostatic bag. I will need further testing with higher load but it is working well right now. Long press on the on/off switch lets you adjust automatic on/off when you connect a charger. Long press on the in/out switch changes from Amps to Watts. Screen is visible outdoors. The only minor flaw is that it doesn’t say input current (it says input current is equal to output current but it’s not true)