Sparkle Blue LED Party String Lights are 30.5 feet, complete with three LED functions: Fast Flash, Slow Flash, and Still Light! Balls: 0.75 in. diameter Note: Sparkle Lights must be plugged in to work. However, to turn these off, you must unplug the piece. It will not turn off simply with a press of the button, it must be unplugged. To turn on and off, it must be either plugged in or unplugged. Length: 30.5 feet Lights do not include batteries, but instead must be plugged in to an outlet.