Engineered to fit almost any farm/gate (generally pipe-rail), the user-installed Bump N' Drive Gate Opener works by mechanical and gravitational means (no electricity needed). The kit includes bumper arms, gate- and post-side hardware, instructions, and DVD. Operation merely involves the vehicle pushing against the PVC-sleeved bump arm on the gate at slow rolling speed and continuing to push as the vehicle passes through until the gate swings completely open, where it will be held for several seconds before automatically closing. For gates 14 feet or longer, use of a gate wheel is recommended to prevent sagging.