Battery-free direct power supply module - automatic power-on

1.No battery direct power supply
2.Support power on auto power on
3. Support delay (3 seconds, 10 seconds, 20 seconds, 30 seconds) automatic power-on
5. Input 5-12v
6.Output 4.2v(4.4v) 4A
7.Size 50mm*25mm

diy example