Confirm that the phone case H1 and the mobile phone are fully charged and working normally. 2. Do the waterproof test of the phone case Hl before use. 3. Phone data backup. 4. Remove the phone case and make sure the phone is in "airplane mode" before diving. 5. start up. * This Product has passed the waterproof test before leaving the factory. This operation is to reduce the possibility of other risks.