How to install mighty mule automatic gate openerSafety BarrierInfrared Beam Sensor (Optional). Its opening time, angle and speed can be adjusted. Heavy-duty for dual swing automatic solar gate opener kit with waterproof keypad the gate opener system is equipped with various safety devices. Suitable Leaf’s Length1.5 to 2.5 meter / Leaf (4.9 to 8.2 feet’s …