These bright clear lights are sure to bring brightness to your home and decorations. If a bulb does burn out, the rest of the string will remain lit. The UL listing allows these to be used both indoor and outdoor, so whether you choose to use the lights on your Christmas tree or to decorate your yard, we have you covered. Product Features: Number of bulbs on string: 450 Three sets of 150 lights for a total of 450 lights Bulb size: mini Bulb type: incandescent Spacing between each bulb: 2.5" Total lighted length: 83.25' (each strand 27.75') Total string length: 90' (each strand 30') 24" lead cord 3" tail cord Additional Product Features: If one bulb burns out, the rest will stay lit Contains end-to-end connectors which allows you to connect multiple sets together (not to exceed 210 watts) Comes with replacement bulbs and spare fuses UL certified and approved for indoor/outdoor use Wire gauge: 22 120 volts, 60 hertz, 0.2 amps, 24 watts