Remote opener kit features heavy duty 12 volt solenoids capable of 1/2” travel. This system is popular for cars and trucks with stock latches that require this amount of force to operate the door latch. System is designed to neutralize the transmitters when the ignition is on, this eliminates the possibility of the doors being accidentally opened when the car is running. Kit includes: 2 solenoids, 2 transmitters, receiver brain box, under vehicle auxiliary switch, and instructions