This module is needed on ES models to correct electronic shifting issues after reduction. 2005-2011 Foreman 500 use this early style module as well as 350 Rancher ES, 400/450 Foreman ES and 650/680 Rincon. Certain models will need two modules, message us about your model for further info. We pre-program these for your reduction size for most models. The manufacturer states the module is waterproof to 10' depth.