This is a combo pack of the Rounded Edge Rectangle Evolv Micro-USB Charging Cradle and the optional clamp. This limits your material choices to the strong and flexible plastics but saves you some money. If you choose not to use the clamp you can secure the charging board to the cradle with glue or epoxy. This requires that you cut an opening in your case approximately 16.8 by 7 millimeters. The face plate is 18.8 x 9 millimeters and provides at least a 1 millimeter overhang in all directions from the required opening and should work with cases that are up to about 5 millimeters thick. Additional support may need to be provided under the clamp depending on how you choose to mount it.