This is the Reverse Module for HPI's Savage 1/8th scale truck. FEATURES: Allows the Savage to operate in two speeds of reverse with a 3-channel radio system INCLUDES: Pre-assembled reverse module All hardware (linkages, screw, collars, etc) for hook up Detailed step by step instructions REQUIRES: One standard servo 3 channel radio system (3rd channel must be switching type, not proportional) Installation into the Savage vehicle