The SDS Max Demolition Hammer (H45MEY) with AC Brushless Motor, UVP (User Vibration Protection) and AHB (Aluminum Housing Body) is the perfect combination of performance and comfort. With highest demolition performance in its class, it can complete the most demanding jobs with ease. It features AHB construction that provides significant durability and extended tool life. UVP technology can reduce down-time and vibration related injury. The Brushless Motor allows the tool to operate over an extra long extension cord with reduced power loss, and also eliminates maintenance of armatures or carbon brushes. The push button impact selector also serves as a diagnostic tool to trouble shoot overload or overheating issues. This demo hammer delivers superior performance when powered by a generator due to an internal inverter circuit that regulates uneven power supply for ultimate jobsite performance.