There will be provider return policies but there may be state laws to protect you as well. Ask the audiologist about the possibility of trying one hearing aid for a while and then trying another one out for a while to compare. Be aware that it may take a while for the brain to adjust to a hearing aid, so you can't always determine right away if you will like it. Be aware that hearing aids do not work well in all situations. Assistive listening devices, such as FM, infrared and loop systems, used in conjunction with hearing aids, improve hearing aid effectiveness in difficult listening situations, such as noisy restaurants.
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