Jabra EVOLVE 30 II UC Stereo, Wired, Office/Call center, 150 - 7000 Hz, 171 g, Headset, Black Jabra EVOLVE 30 II UC Stereo. Product type: Headset. Connectivity technology: Wired. Recommended usage: Office/Call center. Headphone frequency: 150 - 7000 Hz. Cable length: 2.15 m. Weight: 171 g. Product colour: Black