Jabra/GN Netcom GN2100 USB. Device connectivity: Wired. Acoustic system: semi-open, Headphone frequency: 80 - 15000 Hz, Headphone sensitivity: 118 dB. Weight: 50 g. Certification: IEC 60950-1 EN 60950 AS/NZS3260 UL 60950. Compatible operating systems: Microsoft Windows, Mac OS