Micro-dot



A micro-dot was a type of espionage equipment that was so small it couldn't be easily noticed by people that were unknowing.

They were often times mini-cameras, homing devices, tiny written messages or even surveillance devices.

Earth-1A
When LeBon and Wilbur were stealing diamonds, the Super Friends came up with a plan to have micro-dot homing devices implanted on diamonds that they thought they would choose to steal next, so as to keep tabs on them, and locate their base of operations; which is what they did.

External Link

 * Micro-dot at Wikipedia