Makita Chainsaw has excellent cutting performance Features a brushless motor and variable speed can be controlled by the trigger Has oil capacity display, kickback brake and electric chain brake Speed can be controlled constantly and the automatic chain lubrication can be adjusted easily Comes with an ergonomic soft grip design and lock-off lever. Also the main power switch with auto power-off function Requires 2 x 18 V Li-ion batteries in series to supply energy to the powerful 36 V DC motor drive system The battery protection system provides over-discharge protection for prolong and enhanced battery cycle life and overall battery life Prevents loss of nut when removing sprocket cover to replace the saw chain or guide bar Chain speed: 0-20 m/s and bar size is 40 cm