USAutomatic 020332 Single Gate Basic Kit with Lock Sentry is designed to be installed on farm gates up to 20 feet, ornamental iron gates up to 12 feet and chain link up to 14 feet The solar option for charging allows for remote installations and qualifies for a 30% federal tax credit Sentry's energy efficient design makes it the first truly solar charged gate opener that eliminates the need for AC power to charge battery Made in the USA and powered by a 12 vdc battery which is charged by the included solar panel kit or AC transformer The Sentry Plug N Go wiring harness eliminates the need for wiring and makes installation simple