This Bosch GOP 18V-28 Brushless Starlock PLUS multi-cutter is an oscillating multi-tool fitted with the high performance EC brushless motor. These motors are extremely energy efficient resulting in much longer battery run times (30% more than a standard DC motor). Brushless motors are maintenance-free compact & lightweight. The motor gives the GOP 18 V-28 similar performance to a mains powered equivalent. The GOP 18 V-28 features the latest Starlock accessory mounting system. Starlock is a joint development by Bosch & Fein. This " Snap-in" system gives you quick tool-free accessory changes in less than 3 seconds. The innovative Bosch Electronic cell protection (ECP) protects the battery against overload overheating & deep discharge extending the lifetime of the battery.