Konftel 200NI. Headphone connectivity: 3.5 mm. Frequency band: 0.2 - 3.7 GHz. Weight: 700 g, Cable length: 7.5 m. Operating temperature range (T-T): 5 - 40 °C, Operating relative humidity range: 20 - 80 %. Power supply type: 12 V DC/230 V AC