Features: Operating Voltage:3V-5.5V PCB Material: FR-4 A fiberglass board Size:Approx. 29 x 23mm/ 1.14 x 0.91inch 5 LED Lights The 5 LEDs will flash with the rhythm of music or other sounds; it can be used as light for music dancers. Package Includes: 1 x Sound Control LED Melody Lamp Module