The Makita DHR400ZKU Brushless LXT Rotary Hammer is powered by 2 x 18V Li-ion batteries in series to supply energy to the powerful 36V DC motor drive system. It offers 2-modes of operation: Rotation with Hammering and Hammering Only. The brushless motor offers increased efficiency, whilst the built-in constant speed control and torque limiter provide increased control. A 'Soft No Load' function automatically reduces the motor speed during idling to suppress the vibration of the machine body. For added user safety there is an electric brake and soft start feature. It can be attached to a dust extractor, providing a cleaner working environment. Utilises the Auto-Start Wireless System (AWS): connects to compatible dust extractors with Bluetooth®. The dust extractor automatically runs while the switch is on. Comes as a Bare Unit, No Battery or Charger. Specification: Modes: Rotation with Hammering, Hammer Only Shank: SDS MAX No Load Speed: 250-500/min. Impact Rate: 1,450-2,900/bpm Impact Energy: 8 joules Capacity: Concrete: TCT Bit 40mm, TCT Core 105mm Weight: 7.3kg