The 21” Brushless Adaptive Speed Mower is ideal for yards up to ½ acre in size. Brushless technology provides consistent power without bogging down. With Adaptive Speed Self-Propelled Technology, this tool adjusts to your pace instantly. Height modifications are easily made with a single-point height adjustment knob instead of adjusting each of the 4 wheels individually. For compact and easy storage in your garage, this mower is equipped with folding handles. Choose how you want to mow with bagging or mulching capabilities. All a part of the 40V System where you get ALL POWER, NO GAS.