Those who are not particularly technically inclined may not realize that you actually need a number of things in order to successfully transmit radio frequency signals, and the most important one of these is a very small device called a transponder. A transponder actually receives and emits radio signals and comes in many available types, including an aircraft transponder or beacon, which is responsible for receiving communications from a base station. Yet another entirely different type of transponder is an RC transponder, which is a device typically used for remote control car racing. In this application, the transponder serves as a timing system for the vehicle, performing tasks like keeping track of laps and measuring voltage. Though you may not have a familiarity with transponders, these tiny titans cannot be overlooked because of their vast importance and their use in an array of applications, which is why you can find them in wide selections from reliable sellers on eBay. While you may not completely understand the ins and outs of a transponder does, it quietly helps to enhance your life in a number of important ways.