GD AX ENCHANCED BLUETOOTH HEADSET Originally developed for use in tanks and helicopters, Jawbone PRIME NoiseAssassin is a proprietary technology that eliminates background noise from mobile phone conversations. Jawbone is the only Bluetooth headset with a Voice Activity Sensor VAS that actually feels your speech, which helps Jawbone distinguish your voice from background noise. As a result, Jawbone offers better audio quality than any other headset on the market.