Bosch RHH181-01 18-Volt Lithium-Ion Brushless 3/4-Inch SDS-plus Rotary Hammer Pneumatic Hammer Mechanism: Bosch engineered for maximum performance, lifetime and efficiency Innovative Brushless EC Motor: Same power, but smaller and lighter weight with higher efficiency, less maintenance and longer life 3-Mode Selector: Rotary hammer, rotation only and now with chisel Electronic Motor Protection (EMP): Protects motor from overload damage Electronic Cell Protection (ECP): Provides 2X battery life by preventing overheating in tough applications