Here are a few quick examples:
AM radios
FM radios
TV sets
Garage door openers
TV remotes
Flashlights
Microwave ovens
Microwave radios
Your eyes
Police speed radars
GPS receivers
Cellphones
Smartphones
Cordless phones
X-ray machines
Cameras
CT scanners
MRI machines
Police radios
Ham radios
Car headlights
Weather radars
Bluetooth headphones
Space heaters
Campfires
LEDs
Lasers
Bassboat fish-finders
Weather satellites
TV satellites
Space probes
