Micro-bug

The micro-bug is a Cybertronian device used for covert spying. It consists of a small camera lens and an internal antenna capable of streaming live video across large distances.

The Transformers cartoon
Ravage planted one on Bumblebee under cover of a fight while the Autobot was taking a polarizer back to Autobot headquarters. The bug then proceeded to relay sensitive information about Wheeljack's new invention back to Decepticon Headquarters, cluing Megatron in to the device's existence. The Decepticons then stole the Wheeljack Instant Immobilizer and used it against the Autobots.