This product adopts passive infrared(PIR) motion sensor to detect the protective area and then emits ultrasonic wave to repel unwelcome animals, such as dogs, cats and birds from your lawns, garden, flower beds, etc. It's used for outdoors. It's environmental-friendly and powered by solar energy, no chemical, safe for humans and pets and won't even harm the pests you are trying to repel.  Specifications: Type: No Flashing Light / With Flashing Light(Optional) Color: Dark Green Material: ABS Solar Panel: 5.5V 0.11W Rechargeable Battery: 4 * 2/3AA 300mAh battery(Included)   Working Time: 6-8 hours when fully charged Effective Distance: up to 8M(depending on weather and environment) Detection Angle: 110 degrees(depending on the weather around) Ultrasonic Frequency: 25-61KHz Waterproof Grade: IPX4 Product Size: 14 * 9.3 * 37.5cm / 5.5 * 3.7 * 14.7in Product Weight: 255g / 9oz Package Size: 15.5 * 14 * 7cm / 6.1 * 5.5 * 2.75in Package Weight: 310g / 11oz Package List: 1 * Animal Repeller 1 * User Manual(English)