This starter relay solenoid is designed for use with select ATVs and UTVs.It is constructed with copper, EPDM, and metal materials to deliver cranking power and reduce startup switch current.Terminal markings: “B” for connection and “M” for motor connection—do not reverse connections.Operates at 12V.Compatible with models including 300 2X4, 300 4X4, 400L, Big Boss 250, 300, 350, 400 6X6, Scrambler, Sport, Trail Blazer, Trail Boss, XPlorer, XPress, ATP, ATV Pro, and Explorer across various years and configurations as listed.Includes one starter relay.Color may vary slightly from photos.