repeater
re-peat-er
noun
A person or thing that repeats an action, especially a crime or an academic year.
"He was a known repeater offender in the area."
noun
A device that receives and retransmits a signal to extend its range.
"The Wi-Fi repeater boosted the signal upstairs."
Thesaurus
Synonyms: recidivist, habitual criminal, repeating firearm