For indoor and outdoor use. Replaceable LED lights. Cool burning bulbs. Safety fused plug for overcurrent protection. Connect up to 27 sets of this exact 100 count lights end-to-end – includes only 2 strings. Number of bulbs: 100. Total wattage: 7.8W. Overall string length: 34 ft (10.3m). Lighted length: 33 ft (10m). Socket spacing: 4 in (10.1cm). Wire color: black. Spare parts (each light string): three 3.1 Volt LED bulbs and two 3 Amp fuses.