Please Note: Products are designed and rated for use in the United States using 120 volt current. With or without a transformer, this product is not recommended for use outside the US. 100 Count Clear Lights are 21' in total length and burn steady or two-way flashing. If one or more goes out, the others stay lit. Set is UL Listed and can be used indoors or outdoors. Cord color is white. Has end to end plug to attach more light strands (other strands sold separately).