Medium Base String Light with Cord Color/Size: Black/48' These strands can be plugged end-to-end.&nbsp; Can use up to a 25 watt bulb per socket. Max run is 1440 watts. You can plug 5 strands together using 11 watt bulbs, 4 strands using 15 watt bulbs and 2 strands using 25 watt bulbs. 10 strands max using LED bulbs due to voltage drop.&nbsp; If one bulb burns out, the rest stay lit. Manufactured with 14-gauge wire and high-quality sockets. PVC socket forms a tight weatherproof seal around the bulb. For indoor or outdoor use and typically permanent installation.