Solar Ultrasonic Bird Repeller | Motion Sensor Garden ProtectionUltrasonic Bird Repeller Solar Powered Safe bird repellant: No chemicals and does not harm the animals Solar Powered: You can also use 3 AA batteries as an alternative source of power Adjustable switch, motion sensor, and ultrasound speaker Size: 15 x 12 x 7cm Battery: 3x AA Rechargeable 800mAh Battery(Included) Effective range: 5,000sq. ft. Some homes are more appealing to common birds like pigeons and doves especially those that have flowery gardens