The TruTone Plus artificial larynx is the best speech aid money can buy, and now it is even easier to use than ever, with the built-in micro-usb charge port. It is the only instrument that allows you to express yourself with true voice prosody -- not just one or two tones, but a smooth range--all in a single button. Your voice quality will be a step above with this device. In fact, the University of Minnesota has recently made a study proving intelligibility can improve up to 14% or more by using the unique intonation capabilities of this amazing instrument.