For installation it is only necessary to sink them into the surface where they are to be displayed. The outer shell of our ground lights is constructed primarily of anti-skid reinforced glass and aluminum and the inside is completely water-proof. They are fitted with an ultra-capacitor which gives them a long-lasting service life of 7-10 years. When it is necessary to change the batteries however, it is easy to do so without disturbing the initial installation. In addition, we offer 5 LED colors for you to choose from: yellow, blue, red, green and of course white.