Model number: MT-HP002 Speaker: φ40mm Size: 170 x 70 x 180 mm; sensitivity: 116 ± 3 dB 155±2g in weight Impedance: 32±15%Ω System compatibility: Windows XP, Vista, 7, 8, 10, 11, and MACOS Response frequency: 20–20 kHz Omnidirectional microphone Mic diameter in units: φ6.0±5.0 mm Mic Sensitivity: -35±3 dB Interface: 3.5 mm Length: 1.20 ± 0.01 meters