MiniMag Plus Extra Large Waterproof Strong Magnetic Stash Box - All Weather Hide a Key, Magnet Mount Locker Box, Geocaching Container, Under Car GPS Tracker Holder Case

Neodymium magnets are the strongest type of permanent magnet commercially available. And we added two!
This water tight box with twin magnets is great for holding and protecting your GPS Tracker. Its inside dimensions (3.2x1.5x1.8 inches) will hold the best trackers. (View Images)
Used by law enforcement and private detectives, it is surely going to work for your application.
Works Great as a key holder box or anything you can think of.

Not compatible with the Optimus 3.0. Only the Optimus 2.0.
Extremely strong case – Attach to any flat metal surface – Magnets will hold at fast speeds and bad weather.
Used by law enforcement and private detectives.
Inside dimensions 3.2 x 1.5 x 1.8 inches.
Waterproof Twin Magnet Case – Strongest Magnets Commercially Available (NdFeB) Magnets.
Not compatible with the Optimus 3.0. Only the Optimus 2.0.
Extremely strong case – Attach to any flat metal surface – Magnets will hold at fast speeds and bad weather.
Used by law enforcement and private detectives.
Inside dimensions 3.2 x 1.5 x 1.8 inches.
Waterproof Twin Magnet Case – Strongest Magnets Commercially Available (NdFeB) Magnets.

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OPTIMUS Waterproof Twin Magnetic Case 2.0 GPS Tracker - GPS Tracker not Included;