MySignShine is a completely automatic solar-powered sign light. Simply turn it on and attach it to any type of sign. When the sun sets in the evening, MySignShine will automatically activate and the LED lights will come alive and stay lit for hours. In the morning, the sun will recharge MySignShine for the next evening. MySignShine contains a self-charging lithium-ion battery that never needs to be changed. MySignShine is 12-inches long, 1-inch tall, and 1.25-inches wide. Each MySignShine comes with 3M™ Command™ Outdoor Strips that make attaching to any signpost as simple as peel and stick. If your desired location is susceptible to theft, we suggest installing the unit with metal screws or plastic zip ties that are each sold separately. Both of these attachment options require a tool to remove.