These signages are operated by auto-blinking solar cells. You don’t require any conventional power supply point or battery. These solar cells are also active when placed in indoor ambient lighting. Besides, they are easy to install at the desired location. To fix them at a desired location, you just have to paste them with 3M tape.
Solar signages come in a variety of models and are available without size constraints. They are fitted with an outer acrylic casing that prevents damage from dust and moisture.