Only suitable for incandescent (Krypton / Xenon) Mag-Lite flashlights using 3-7 cell. Don't use for any 2 cell!. Simple replacement, just like a bulb change. Integrated overheat protection and a special thermally conductive housing of the module for better heat dissipation. Energy-saving up to 10 times the run time compared to Krypton or Xenon bulb. High shock and vibration resistance. With newer Mag-Lite (Bi-Pin) the white adapter must also be removed (simply pull out). Mag-Lite that have been originally fitted with LED from the factory can NOT be retrofitted with the LiteXpress LED Modules! Mag-Lite Series ML25IT can not be modified!