The Magnetic Mount case is an additional accessory for either the GL 200, GL 300, GL 300W, GL300MG or GL 300MA Queclink model GPS Tracking devices (TRACKER NOT INCLUDED). The case uses a strong magnet that is used to attach the GPS Tracker to any magnetic surface. The magnet simply adheres to the magnetic surface and is very durable. The case is weatherproof and built to withstand extreme conditions.