4in1 Dog Training Shock and Vibration Collar by Atc The strong static impulse can penetrate the hair of the pet and fabric wihtin 6mm thick. It is unneccessary to let the discharging point touch the skin of the pet. The static impulse can quickly and effectively curb the improper deeds of the pet. The warning vibration will let the pet associate the vibration with the static impulse. Both the static impulse and warning functions are set with automatic stop