Scarecrow senses animals the same way security lights detect people, movement and heat.
When an animal is 'seen', a valve opens instantly releasing a three-second pulsating spray of water. The combination of sudden noise, movement and water frightens animals away. Passive infrared detector operates unattended and 'sprays' when movement is detected. Water based concept safely and effectively repels animals without chemicals, visually objectionable barriers or shock. Highly sensitive, able to detect very small animals.