... ODM 3.CE GS Rohs 4.durable housing 5.changeable carbon brush Professional DC Impact Wrench(Model No.:AB644)CE GS Rohs ... certificate ,professional use,Durable housing,changeable carbon brushwith 14.4V,2.0Ah Ni-cd Battery and 30mins ... user complete control over the impact speed.5.Carbon brush access, allows user to replace brush as needed to greatly prolong the life ...