The NuVois III Digital is an electro-larynge digital speech aid with state-of-the-art electronics. Digital frequency. A programmable electronic circuit allows for full digital control of all functions. The unit features volume and tone/pitch buttons for easy adjustability, allowing the user to add inflection to their speaking voice for emphasis and a more natural sounding voice. There are also dual on/off control buttons that can be set independently of one another for two separate speaking volumes; one low for more intimate situations, and one high for situations with more background noise. Simply move from one button to the other.