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.Details:ClearTotal lighted length: approximately 90 ft. 24" lead cord3" tail cordGreen wireNumber of bulbs on string: 450Three sets of 150 lights for a total of 450 lightsBulb size: miniBulb type: incandescentSpacing between each bulb: 2.5"If one bulb burns out the rest will stay litContains end-to-end connectors which allows you to connect multiple sets together (not to exceed 210 watts)Comes with replacement bulbs and spare fusesUL certified and approved for indoor/outdoor use