H8321 Specifications: Sound: stereo Frequency response: 20 Hz - 20 KHz Speaker size: 40 mm Speaker sensitivity: 118 dB ± 3 dB Speaker impedance: 32 Ω Microphone type: omnidirectional Microphone size: 6x5 mm Microphone sensitivity: -58 dB ± 3 dB Connectors: 2x 3.5 mm jack Cable length: 2 m Feature Closed, over-ear design for powerful bass sounds Soft-cushioned, synthetic leather ear cups and headband On-ear volume control Telescopic headband for a secure fit.