Spy Tec M2 Waterproof Weatherproof Magnetic Case for STI GL300 Real-Time GPS Trackers Magnetic Weatherproof Case - Provides FIRM Magnetic Mount which is the key to knowing the Spy Tec GLCase will remain securely attached The sturdy and waterproof design is perfect for long term GPS tracking, suitable for use on moving vehicles outdoors - keeping the interior safe from moisture and corrosion Compatible with: GL-200, GL-300 (and all compatible models) and any other units that will fit inside of the secure casing Includes 2 Powerful Magnets to Attach to Any Flat Metal Surface This extremely cover design measures only 5" x 2.2" x 1.4" and is built with disable PC and ABS plastics for long term protection and monitoring