I recommend that everyone get a t-coil in their hearing aid. The incremental cost is usually small, but the expanded functionality is huge. A t-coil or telecoil transmits the sound within any looped area directly to your hearing aids, cutting out background and other noises, letting you focus on what you want to hear. This is incredibly helpful at theater performances, in meetings, or when talking to your taxi driver. Of course the t-coil only works in a space that has a hearing loop installed.