High output demolition engergy upto 25J Speed adjusting switch help different kind of concrete break Super silent design give your hand less vibration Easy oil lubrication system for easy maintenance SDS-MAX chuck system for big Chisel holding LED light indicated when carbon brush worn out MODEL RW-11EH Capacity 490 kg/hour concrete Power Input 1500 Watts Full load impact rate 1300 BPM No Load Speed (r.p.m) 120-250 / min Impact Energy 6-25J Approx Net Weight 11 Kg.