Definition of "Repeater" :

noun: (electronics) electronic device that amplifies a signal before transmitting it again

"Repeaters can be used in computer networks to extend cabling distances."

noun: a firearm that can fire several rounds without reloading

noun: someone who is repeatedly arrested for criminal behavior (especially for the same criminal behavior)

noun: a person who repeats

"The audience consisted largely of repeaters who had seen the movie many times."