This video is about Buzzer Review
This buzzer is a 3 in 1 unit, It will work on any RC vehicle and can function as a buzzer, lost signal alarm, and voltage alarm.
http://www.amazon.com/Targethobby-Voltage-Buzzer-Discovery-Signal/dp/B01ET7P3LA?ie=UTF8&psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00