Az Import & Trading BC513AB Singing & Chirping Birds - Realistic Sounds and Movements - Blue Jays A beautiful decoration for your home. Powered by 3 x AA batteries. Sound activated - bird flaps and sings when there is a noise. Sound activation works by detecting increase in noise level&#44; so it will work even in noisy environments. Can be used as a security device &#40;bird things when someone makes noise&#41;.