Weatherproof Bird-B-Gone Bird Chase Super Sonic Sound Deterrent system broadcasts distress and predator calls every 10 minutes to rid your property of nuisance birds. When birds hear the calls, they naturally flee. LCD panel on the bird deterrent sound system shows the status and user settings. Unit is 110V. Main Unit has a built-in speaker. Attach additional bird b gone speakers (included in kits, Item #s 198210 and 198211) to increase coverage area. Each complete system covers up to One acre.