Magnetic Weatherproof Case - Provides firm magnetic mount which is the key to 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 most GPS trackers: GL200, GL300, GL300W, GL300MA, Queclink etc. It can also be used for multiple purpose, like to store keys, USB drives, valuables etc. | Internal dimensions (without sponge inserts) in inches: 3 3/8" x 2 3/4" x 1 7/8" // Internal dimensions in centimeters: 8.5cm x 7.0cm x 4.8cm | Waterproof and weatherproof. Thoroughly tested in all environments: snow, rain, mud, etc. | Rust-proof Neodymium magnets. Built with the strongest Neodymium commercially available and can withstand over 50lbs of separation force.