The perfect addition to your dock, the Dock Edge Dock and Deck Solar Light Ultra installs easily in minutes and runs for 20 hrs. on a full charge. It's made from durable polycarbonate and measures 4.53" x 4.13" x 0.79"• Runs for 20 hours on a full charge• Installs easily in minutes• Made from polycarbonate• Automatic on at dusk• 2V, 200mA solar panel• Ni-MH 1200mAh battery• IP68 waterproof rating• 4.53" x 4.13" x 0.79" Runs up to 20 hours on a full charge Automatically turns on at dusk Water-resistant IP68 rating