No more bumping or turning off the motor to hassle with hand feeding string or dealing with frustrating pull cords. The Black & Decker 18 Volt Cordless Trimmer/Edger features the Automatic Feed Spool (AFS) system that automatically advances the cutting string without bumping. By letting centrifugal force feed the trimmer line as it is needed, you get a smooth consistent length of line for optimal performance. It is battery-powered with the capacity to trim grass after mowing on a single charge of both 18 volt batteries for up to a 1/2-acre home. The Black & Decker 18 Volt Cordless Trimmer/Edger has a patented gear drive transmission that amplifies the motor torque to increase cutting power and performance. It easily converts from a trimmer to an edger with the push of a button to cut along sidewalks and driveways for a clean, manicured look. It also has a precise edge guide to ensure a clean finish along pavement. The Black & Decker 18 Volt Cordless Trimmer/Edger is quite and easy to start with an instant start trigger that eliminates the need for frustrating pull cords. It does not require gas, oil or tune-ups and it has a balanced, lightweight design, making it comfortable to use. The Black & Decker 18 Volt Cordless Trimmer/Edger also has an adjustable handle and telescoping shaft that allows you to fit it to your height.