The ReSound Smart is compatible with the following hearing aids: ReSound LiNX² 9/7/5, ReSound LiNX 9/7, ReSound LiNX TS 9/7, ReSound ENZO² 9/7/5, ReSound ENZO 9/7, ReSound UP Smart 9/7/5 hearing aids. Note: Your hearing aids may need to be updated with the latest firmware to work with the app. This update is available through your hearing care professional.