The solar light XSolar SOL-O keeps your house number shining brightly. And it does so not only wirelessly but also at no cost. Available in anthracite and silver, this light operates solely on solar power, thereby reducing your energy costs. Thanks to a twilight switch, the lighting automatically turns on when darkness falls. XSolar SOL-O features a patented, intelligent microprocessor control and an extra strong lithium-iron battery that ensures light all year round, 365 days a year.