Solar White LED Round Polycarbonate Road Stud Deck Dock Path Lights are naturally charged by the sun. The 6 Cool White LED's come on automatically as soon as it starts getting dark and last for up to 20 hours. They can be seen from a distance of 650 yards. These lights are ideal for illuminating paths, decks, docks, driveways, and pools with it's IP 67 rating. It is cost effective, easy to install and require absolutely no wires or maintenance. Dimensions for these lights are 4.5" in Diameter and 1" Tall. Product Information: Returns and Exchanges up to 30 Days, Installation and/or assembly instructions must be followed, and Reusable Revolution, LLC cannot be held liable for product malfunction due to improper installation or use.