Final answer:
The client's understanding of the use of a behind-the-ear hearing aid is indicated by their commitment to cleaning it regularly with a soft, dry cloth. Volume adjustments should be made while wearing the device, and it should be stored in a dry place.
Step-by-step explanation:
A nurse is caring for a client who has recently started using a behind-the-ear hearing aid. The statement that indicates the client understands the use of this assistive device is: I'll clean the hearing aid with a soft, dry cloth regularly. This practice is essential for maintaining the device and ensuring its longevity and proper function.
Additionally, the client should know that they need to adjust the volume after putting the hearing aid in their ear, not before, to avoid excessive amplification that could potentially cause further damage. Moreover, keeping the device in a dry place when not in use is important to avoid any moisture-related damages.