This Pro Solar Dock Light is a great addition to any dock, deck, or walkway. Light automatically turns on when it becomes dark outside and can be seen up to 1/2 mile away. Highly reflective light is corrosion-resistant for extended durability. Aluminum construction meets IP68 waterproof rating standards. No maintenance required. 4-1/4" x 3-3/4" x 7/8". Visible up to 1/2 mile away Designed with an IP68 waterproof rating Brightness: 10-15 lumens | Pro Solar Dock Lights, 2-Pack, Blue