Binaural headset with headband for desk phones Ultra-noise-cancelling microphone filters background noise ActiveGard technology protects you from sudden sound surges Wideband bandwidth for a natural sound Large leatherette ear-pads for exceptional wearing comfort and powerful sound 90° rotating earpieces for space-saving storage Weight: 110 g Connecting the headset requires a connection cable OR amplifier Neither option is included and both must be ordered separately. Please note that the required connection cable varies by phone. Please specify your phone model to enable us to provide the correct cable. The amplifier does not require an additional connection cable.