1The infrared sensor detects moving objects, triggers 120 dB alarm sound and supersonic sound and strong light, prevents the invasion of bad people and large dangerous animals, and expels them to protect personal safety. 2Passive infrared sensors (PIRs) detect movement and trigger ultrasonic speakers to make sounds that people can't hear, but drive away common outdoor pets such as dogs, cats, deer, raccoons, mice, skunks, squirrels, etc. 3Solar power supply and environmental protection to recharge the batteries so it is always woking. 4Weather-proof allowing it to work all year-round and in virtually all weather conditions. 5The pointed end is inserted into the ground, being stable equipment.