Emanate And Die
Read this tale from The Belmont Club, both as a history lesson and as a warning.
Radio frequency energy ("RF") is emitted from all devices that are receiving power.
That RF can be detected and then used to locate you.
Think what advances in technology have been made since the U-boats tracked Allied convoys across the Atlantic.
Think about what Uncle Sugar can do now.
Do you understand now why smart folks think about avoiding tactical radios, while pulling the batteries from their cellphones and any other battery-powered gear?
RF emanations can get you overheard.
Worse yet, they can get you found, fixed, and fried.