Oregon CORDLESS 40 Volt MAX ST275-A6 Trimmer/Edger Kit with 4.0 Ah Battery Pack and C600 Charger Patented gear drive technology for 50% more power versus OREGON ST250 String Trimmer/Edger; Longer shaft for increased reach and improved ergonomics 40V MAX Lithium Ion Power for up to 45 minute run; Premium cell technology with constant no-fade power and that holds charge in storage for months Advanced Cutting System - Larger swath with a new and improved OREGON trimmer head for longer run time, less vibration and easier line loading Ergonomically engineered to be light-weight, balanced, low-vibration, & quiet; Variable speed throttle increases control and run time Instant Start - Freedom from cords, No gas-oil mixing, No pull cords, No warm-up, No emissions