The Yard Force NX100i is the ultimate in robotic mowing, just lay the border line and schedule the mowing times to see results and watch the machine automatically transform your lawn. The mower is ideal for yards up to 1/3 acre, with gradual cutting height adjustments from 1.3" - 3". Thanks to the mulch system with 3 sharp blades, the grass cuttings can be used as a natural fertilizer. The rain sensor enables the robotic mower to go back to the charger station automatically and it also returns when the battery is low.