HOMY Electronic Bird Repeller Outdoor Animal Repeller PIR Motion Activated with Flashing LED Light and Sound to Repel Unwanted Bird Bat Pigeon Away, Airport,Garden, Yard, Farm, Balcony Essentials The product uses PIR Sensor and ultrasonic sound technology which is a humanistic way to expel unwelcome birds;Eco-friendly, safe to human or pets; Effective area: 2152 sq.ft; PIR (Passive Infrared) motion activated, only emits sound and flashing light whenever its motion sensors are triggered, cost effective and energy-efficient; YOU CAN USE NIGHT MODE ALL THE TIME,SO THAT IT WON'T SCARE YOUR NEIGHBORS WITH THE GUNSHOT SOUND WHILE FLASHLIGHTS WILL SCARE THE BIRDS AWAY.Day or Night Modes available for your options. Day Mode: Emits only sound in the day; emits both sound and flashing light at night. Night Mode: Emits only sound in the day; emits only flashing light at night; VERY EASY TO USE: Just install 4 AA alkaline batteries, and select the mode you like. Get rid of noise and damage from unwelcome animals, insect,birds, rats and so on; Support both indoor and outdoor use. Sound and flashing light effectively repel unwelcome animals and pests, bats, birds from your garbage bins, fruit trees, lawns, garden, flower beds, fish ponds, etc.