Holiday Essence 100 Icicle Lights, Clear Bulbs, Professional Grade for Indoor & Outdoor Use, Soft Bright White Bulbs with White Wire, UL Listed. INDOOR/OUTDOOR Safe for Indoor and Outdoors Use! Sturdy Cord & Durable Bulbs - Average Bulb Life: 25,000 hours String to String Wire Energy Efficient LED Bulbs, if one burns out other stay lit Safety Fuse - Can connect multiple light strings, A maximum of 45 of these light strings can safely be connected.