Audina Hearing Instruments Inc, Longwood, Fla., has introduced the expanded flx® family of 312 open-fit hearing aids. The products offers 3 technology levels 4, 6 and 12 channel circuitry, as well as a 312 battery for up to 175 hours of battery life. It features a patented ergonomic design case, a multi-memory pushbutton switch, and iScroll® digital volume control. There are over the ear (OTE) and behind the ear (BTE) styles with an open-fit ear bud or with a custom ear mold. An ergonomically designed case allows for greater ease of operation.