The RAP-300-1U, RAM® Power Plate™ III, a universal magnetic holder designed to hold various devices including radar detectors, e-Toll devices, small mobile printers, and the RAM® Bluetooth Keyboard. The magnetic plate includes two powerful rare earth magnets, composite cradle and one adhesive steel plate (50mm x 38mm x 0.08mm). To connect your device to the magnet, you will need to attach the steel plate to the back or bottom of your device.