Humane, effective, maintenance-free electronic yard protector keeps birds away from your property without messy or expensive chemical solutions. Independent laboratory testing has proven sound technology to be a highly effective form of bird control. Use it to repel pigeons, woodpeckers, swallows, starlings, sparrows and other creatures. Coverage: up to 900 Square Feet Uses: balconies, decks, yards, lawns, gardens, porches, buildings, greenhouses, more! AC adapter included with 50-Foot extension cord OR may be operated with 4-C batteries in motion sensor mode.