This is the amplifier that clarifies sound from a television to help viewers hear dialogue more clearly. Using technology developed by leading neuroscience researchers, the system employs proprietary software to optimize the quality of electrical signals from the auditory nerve to the brain, allowing you to hear a movie or music more clearly. The amplifier reduces distracting background noises and enhances voice clarity, unlike typical models that just increase volume. The included base station connects to a television and transmits sound to the wireless amplifier and earbuds up to 33' away via a 2.4 GHz radio frequency that does not require a line-of-sight connection. The amplifier allows users to easily adjust the dB gain and volume up to 40 dB, it’s no bigger than a smartphone, and its rechargeable battery lasts up to 8 hours after a two-hour charge via the base station that plugs into AC. 4 1/3" H x 2 1/2" W x 1/2" D. (1 3/4 lbs.)