First, visually inspect the O-Ring seal to make sure it is seated correctly and is not brittle or dirty. If it is, replace the O-Ring prior to use of the AquaCase. Remove the cable and headpiece from the Naída CI prior to inserting it into the case. The T-Mic™ 2 or earhook may remain attached to the processor. Use only the PowerCel™ 110 battery with the AquaCase. Ensure the processor is powered on and select the program that supports AquaMic or UHP headpiece microphone input. Use the outline of the processor located on the inside back wall of the AquaCase as a guide for inserting the Naída CI. Slide the Naída CI into the AquaCase until the connection is made. The Naída CI should fit tightly to the back wall of the AquaCase and lie flat against the bottom surface.