This impact wrench has multiple gears. You don't need to bother with a cord, since it runs on a rechargeable battery.
From Data Powertools
Metabo SSW 18 LT 300 BL 1/2" 18V Impact Wrench Body Only With MetaBOX
Conrad Electronic
Metabo SSW 18 LT 300 BL 602398840 Cordless impact driver 18 V w/o battery