Producing intensively pulsating ultrasonic sounds are found by martens and similar rodents especially unbearable, and therefore is capable of scaring away these animals. This "Marten Repeller" includes 4 small ultrasonic loudspeakers to achieve radiation of the ultrasonic sound. Indicated by LED. Usage: This module is able to scare away martens from the engine compartment of cars and trucks, place where these animales use to gnaw at cables and other plastic parts! Or to be used in pantries, in the cellar or attics