This is the optional Cooling Fan for the Traxxas Velineon VXL-3 Electronic Speed control. FEATURES: Keeps your VXL-3 running cooler Simple installation requires only snapping the fan housing on the ESC and plugging in the connector on the ESC to the fan INCLUDES: One Cooling Fan Unit with installation sheet REQUIRES: Installation following the included instructions SPECS: Length: 1.56" (39mm) Width: 1.34" (34mm) Height: .83" (21mm) including clips - .47" (12mm) not including clips kpm12/12/2007 ir/jxs