MT-BTH003 is the model. Speaker: φ40mm Sensitivity: 116 ± 3 dB Impedance: 32±15%Ω Response frequency: 20–20 kHz Omnidirectional microphone Diameter of mic unit: φ6.0±5.0 mm Mic Sensitivity: -35±3 dB Interface: TYPE-C Length: 1.20 ± 0.01 meters Measurements: 170 x 70 x 180 mm