Aliph Jawbone Prime Bluetooth Headset (Silver) - Non-Retail Packaging NoiseAssassin 2.0 algorithms, an advanced Digital Signal Processor (DSP), separates speech from ambient noise, VAS (Voice Activity Sensor) identifies and isolates the frequency patterns of the voice, Dual microphones and the VAS accurately models the environment and eliminates background noise, "Invisible button", a touch-surface technology, operates switches by lightly pressing the outside shield