The 19BC25 is a Powerblanket® Summerstep 25' long extension cord used with Powerblanket® walkway, stair, and doorway heater mats that melt snow. It has 120 volts and a 12 amp maximum.
If stair mats are being used for more than one location, a separate power unit must be purchased for each location. Up to 12 amps are allowed per single 6 foot Summerstep power unit. If your connected mats go above 12 amps, you must split up the heated mats and get a second power unit for a separate outlet.