Bird B Gone Solar Bird Chase Super Sonic Deters birds with bird distress and predator calls Ideal for large open spaces where there is no power source, this is a solar powered item and will not work effectively if not place in an area that receives at least 8 hours of full sunlight. Features 24 pre-recorded distress/predator calls to scare birds away. Programmable  you can choose your target bird. General bird setting covers multiple bird species; unit can also be programmed specifically for pigeons, geese, crows, starlings, seagulls, woodpeckers, and more! Solar panels charge and store energy to keep the system operating during cloudy weather. Light sensor automatically shuts off the unit when the sun goes down.