Yealink UH34-Mono Lite, Entry-level USB headset, Noise-Canceling, Binaural, Foam. Technical Specification: Product: Yealink UH34 Lite Mono Teams Product type: Headset Connectivity technology: Wired Recommended usage: Office/Call center Headphone frequency: 20 - 20000 Hz Cable length: 2.1 m Weight: 84 g Product colour: Black