Stretches to fit gate openings up to 20 FT. Retracts to keep gate off ground when open. Electrified when closed, neutral when open. Highly visible and effective. Includes handle, spring, 2 pinlock wood post insulators with galvanized nails, 2 pinlock style T-post insulators, 1 anchor/activator, 1 fence line clamp/tap, and instructions. Equipped to fit wood post or T-post openings.