Part of the AI Series, the FSA 45 delivers STIHL® quality at a value price. It features an adjustable shaft length to fit different user heights and enhance comfort. With its adjustable trimmer head, this tool can adapt to various trimming tasks. It comes standard with the STIHL® polycut™ 2-2 mowing head, making it ideal to cut in hard-to-reach places and large areas of tall grass, plus, you can trim the length of three football fields when its integrated battery is fully charged that's up to 1080 ft. This STIHL® AI Series trimmer is also just 5.1 lb (including battery) for easy portability and maneuverability. This trimmer is a great choice for occasional use on small properties, usage claim tested and verified by an independent third-party test laboratory. Runtime may vary based on battery type, charge level and capacity, model, operating style and conditions.