The extension cords extend the length of an existing power cord; The 3 prong extension cord is rated for Indoor use with equipment such as a desktop computer, HDTV, LED-lit monitor, ceiling-mounted projector, powered speakers, laser printer, and more; The indoor extension cord connects an existing cable to a standard 3 pronged 120V AC outlet receptacle.16 AWG gauge three-prong extension cord is rated for 13 amps to support common voltage power requirements in the home or office. The sturdy but flexible grounded extension cord is safer and more reliable at longer distances than a thinner 18 AWG power cable extension; Fully molded strain relief connectors provide long life and durability