A new hearing aid launched today connects directly to iPhones and other iOS devices, allowing wearers to talk on the phone or listen to music, by GN ReSound, a Danish hearing aid manufacturer. The ReSound LiNX is the first Apple-certified "MFi" or Made for iPhone hearing aid that connects directly to the iPhone or other iOS device without any intermediary devices. Launching alongside the LiNX is a new iOS app that works as a remote for the hearing aid, allowing wearers to adjust volume levels, equalizers, and switch between preset environments for the hearing aid, allowing the device to optimize to the user's environment. Hearing aids can have several different modes, adjusting to the acoustics of each environment -- the app even uses geofencing to automatically change s