Keep your garden free from unwanted animal visitors without the use of traps or harmful poisons this universal pest repeller emits powerful ultrasonic waves that are inaudible to humans but unbearable to animals and birds and just in case they may want to linger the device also gives out a bright flash light that will really scare them off there are five sonic wave settings to choose from to deter cats dogs foxes birds and more powered by the sun it is a highly cost effective humane an