Bird B Gone Solar Bird Repeller is a portable solar powered bird deterrent that uses continuous motion to prevent large pest birds from landing. Solar Bird Repellerhas two 2.5 foot long arms mounted on top of the unit that spin continuously providing a total of 5 feet of coverage. The spinning and sweeping movement scares birds away from the treated area. Solar Bird Repeller is ideal for preventing birds from landing on signs, boats, streetlights, air conditioner units, docks, swim platforms, roofs, chimney caps, skylights, and more. Solar Bird Repeller is sold as a complete unit and includes two AA rechargeable batteries that store enough power to keep the unit spinning throughout the night. In addition, the unit is lightweight, easy to mount, and can be mounted to flat or angled surfaces.