Install the Magic Plate behind your case or battery cover, directly to your rugged case or directly to your Device.;Secure the MagicMount with the automotive-grade 3M adhesive;A larger and smaller Magic Plate is included;Works with: GPS, iPod, iPhone, iPad, smartphones, tablets;Does Not work with iPod Classic or other hard drive devices. The strong magnetic fields Produced by these neodymium magnets is enough to Damage hard drive devices