Display your custom messages indoors or outside in a covered environment. Set includes 20 light up boxes on a string with individual letters, numbers, symbols and shapes, so you can create your own customized messages! Each box has it's own bright white light. An on/off switch is located on the battery box. Requires 3 "AA" batteries (sold separately). Plastic. Each letter is 2 1/4"H x 2"W. String length is approximately 77"L.