The black decker clma4820l2 cordless autosense mower senses the load on the motor and operates at the optimum level for the task performance is increased when more power is needed and the battery run time is extended during lighter cutting tasks the 48cm robust deck is ideal for mowing lawns up to 600m and the grass box has a large 50 litre capacity plastic grass box that is robust and convenient it has 7 settings for height adjustment and a single lever can change the height of the cut from