ProDeals&reg; Eco-friendly Outdoor PIR Ultrasonic Bird Repeller/ Sound Flashlight Harmless Bats Birds Pests Animal Repellent/ PIR Motion Activated Sensor Detector for Yard Garden The product uses ultrasonic sound technology, a humanitarian way to repel unwelcome animals-bats and birds etc from your garbage bins- fruit trees- lawn- garden- flower beds and fish ponds. It selectively repels those animals that are unwanted. The product does not affect people or pets. It can be use at garden, farm, balcony, and other outdoors environment. Sound and flashing light repel animals. Non-lethal- non-chemical humane device. Day time and night time working modes are optional. Gunfire can be controlled: the DAY mode can only emit flash as well, you need to block the light sensor, what is in the middle of the LED Flash light and the speaker.