Sweeper is ideal for clearing driveways, sidewalks, decks, garages. String trimmer features automatic feed spool, no bumping required. Lightweight design, low noise levels. (2) 20 volt max Lithium Ion 1.5Ah batteries. Nominal voltage is 18. String trimmer has lightweight design of only 4.5 pounds. Sweeper has lightweight design of only 3.7 pounds.