General purpose Automotive Change-Over Relay and connecting Pigtail combine to form a Sealed Weather tight unit. Change-Over Relay switches current from one user to another, such as opening and closing power windows. Can be used as a normally closed relay or a normally open relay. The 5 terminal SPDT Relay includes a resistor for voltage spike protection. The unit is sealed against moisture, dirt and dust to help keep unit working properly for an extended time frame. A durable housing with mounting bracket is clearly marked with wiring diagram. Pigtail contains three 12 Gauge and two 18 Gauge wire leads for an easy splice into current wiring harness. When Relay and Pigtail are used together they form a tight weather sealed unit.