This starter solenoid relay is compatible with select HiSun Massimo and Yardsport UTV models, including MSU 400, 500, and 700CC, as well as HS400, HS500, and HS700.It functions as part of the vehicle's starting system by engaging the starter motor when the ignition is activated.The unit mounts securely and integrates with the existing electrical system.Its design aligns with standard specifications to proper fit and.Refer to the product images for physical dimensions and appearance details.