A2. The transparent back plate is the same size as the original back cover. If you choose a lower or medium button , it is compatible with all JSAUX protective cases. Note: if the SD with jsaux back plate wears a protective case, which would cause the SD to accumulate heat so as to affect heat dissipation function of the back plate to some extent,(as most protective cases on the market do). No worries, the SD primarily relies on copper pipes and fans for active cooling, so the impact will not be significant.