<a href="https://www.tomshardware.com/raspberry-pi/how-to-reduce-raspberry-pi-5-4-standby-power-consumption">low power pi5 4</a><br />
<a href="https://www.raspberrypi.org/forums/viewtopic.php?t=249498">under clocking</a><br />
<a href="https://www.raspberrypi.com/documentation/computers/config_txt.html">What is config.txt?</a><br />
arm_freq=1200 arm_freq_min=400 sdram_freq=2400 <br />
sudo nano /boot/<b>firmware/</b>config.txt <br />
watch -n 3 vcgencmd measure_temp <br />
sudo(or watch) vcgencmd measure_clock arm,  pi4/2022