Anti-vibration system: Permanently safe and pleasant working due to minimal vibrations and excellent noise damping. StarlockPlus tool holder: More work progress and greater precision thanks to 100% loss-free power transmission. QuickIN: Tool change in less than 3 seconds thanks to the patented Fein tool-free quick clamping system. With the StarlockPlus tool holder, you have access to around 100 Fein accessories in the Starlock and StarlockPlus performance classes. DC motor: Effective, high-torque motor technology for almost identical performance to the mains version. Stepless electronic speed adjustment. Metal gearbox: High load capacity and maximum service life as all gearbox parts are made of metal. SafetyCell technology: Perfect protection against overload, overheating, and deep discharge thanks to Li-ion batteries with single cell monitoring. The battery charge level can be read directly from the battery.