Quantum announces the launch of its stereo headphone 889 with Mic Speaker: Ø 40mm; Impedance: 32 Ω; Sensitivity: 105dB; Frequency Response: 20-20000Hz; Maximum Power Input: 100mW; Microphone: 6.4*5.0/-58 2dB; Cable Length: 2m; Plug: 3.5mm;