The Frost King RC60 automatic electric roof cable kit contains a 60-foot pre-assembled, ready to install, roof and gutter de-icing cable with necessary roof shingle clips and cable spacers. The cable is 120 Vac, 300 Watts, and include a three-wire grounded plug with a 6-foot power cord. They help prevent roof damage and leaking on residential roofs by keeping gutters and downspouts flowing, even in sub-zero temperatures. UL listed.