The RAP-300-1U, RAM Magnetic Power Plate III, is designed to hold various devices including radar detectors and cellphones. The magnetic plate includes two powerful rare earth magnets, composite cradle and one adhesive metal plate. To mount your device to the magnet, you will need to attach the metal plate to the back of you device. Includes a rectangular 50mm x 38mm x 0.08mm thick metal plate with adhesive back. Material: High Strength Composite Note: The „U” in the part number reflects product packaged in poly bag. The magnetic mount should NOT be used to hold any device that has an internal hard drive. The magnet may damage the drive. This includes the Apple iPod and other small battery operated devices.