Shutdown your monitor, speakers and printer when you shutdown your computer. The USB B connector and the Relay module is fixed into place without glue. Solder and connect the 5v and GND pins to the Relay module to activate the relay when USB power is active. Use your old USB cable from a defective printer. You could also reuse the USB B connector from a defective printer. The Relay module is very cheap from aliexpress

Category: Computer