Pestbye Solar Powered Cat Ultrasonic Repeller (Batteries Included) - Sonic Scarer Powered by an amorphous solar panel - solar power is economical and environmentally friendly PIR (passive infrared sensor) can detect motion within a 30ft (9.14m) radius Solar power means this product requires no cords or cables - simply put in place, and wait for it to charge Handy ground spike makes it easy to place product anywhere in your garden Re-chargeable batteries included (some other sellers of solar cat repellers don't include batteries)