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Every group of Residential heated stair mats and walking mats requires a GFCI (Ground Fault Circuit Interrupter) power unit to connect the system to an electrical outlet. The power unit contains a watertight connector that will allow it to connect to the 1st or last mat in your system. The power unit is rainproof, so it can be left outside for the entire winter season. Power unit cord length: 6'. If you do not buy a GFCI power unit, your mats will not work. Additionally, if you are ordering heated mats for more than 1 location (ie: Front of the house and back of the house) you must order a power unit for each location.