ALEKO’s loop detector automatically opens your gate when a car comes within range; no need to get out and open the gate manually Works in the same principle as stop lights; when a car passes the sensor, the gate opens Solar friendly design will keep your gate opener working without draining the battery Made for use with ALEKO brand gate openers, but comes with a LM157A sensor adapter to be used with other brands' gate openers as well Package includes 50 feet of cable