Fidlock Vacuum Universal Phone Patch Patch It Up If you have a Vacuum Base, you'll need either a compatible phone case or a patch. The Fidlock Vacuum Universal Phone Patch is an adhesive patch that sticks on the back of any conventional smartphone case so you can use the Fidlock Vacuum system. The VACUUM geometry is securely attached to any case with the help of an M3 adhesive patch. An included template helps with the correct positioning and application of the patch. Note: a smooth surface is essential for the suction cup to adhere securely. Features Securely attaches to any case with the help of an M3 adhesive patch An included template helps with the correct positioning and application of the patch A smooth surface is essential for the suction cup to adhere securely | Fidlock | Vacuum Universal Phone Patch Clear