They are just the different names we call 'Postive revealing' and 'Negative revealing'.

                                                    'Low transfer' is 'Positive revealing'---when we tear it off, the words 'VOID' will be revealed on the surface where we stick to, and the rest part remained on the sticker.

                                                    'High transfer' is 'Negative revealing'---when we tear it off, the words 'VOID' will be remained on the sticker, and the rest part revealed on the surface where we stick to.