USER BENEFITS: Tool-less accessory clamp. Lever style lock system allows for quick installation and replacement of accessories – Ergonomically best possible barrel grip, with a perfect circumference size and shape whcih fits the hand for extra comfortable handling – Battery capacity warning lamp Blinking red; Battery power has been nearly used up. Solid red; Battery power has been used up (Battery protector will shut off the power.) Accessories can be installed at 30º increments, across 360º Variable speed control dial – Soft start – Anti-restart function – High operating efficiency.