Yamaha VSP-CU2 - Speech Privacy System ProcessorWith new Info Masking Technology, the VSP 2 is a speech privacy system that prevents information leakage by reducing human voice intelligibility for the accidental, external listener. Features 2x2 Inch micro speakers and a control unit with 3 easily adjustable sound elements. Speech Privacy Better Than Sound Masking Utilizes a custom combination of natural sounds to mask sensitive information at up to 8db lower than traditional sound masking systems.