The solar-powered light inside each of these post caps automatically turns on at night for a colorful display on all four sides. One style features colorful poinsettia flowers, while the other showcases beautiful cardinals and holly leaves. Hole for post opening is 4"Sq. Each includes 1 "AAA" rechargeable battery. Plastic. 6 1/2"Sq x 3 3/4"H. Available in Cardinal or Poinsettia.