Specification: Mic size: 6*5mm Mic sensitivity: -38 3dB Mic directivity: omnidirectional Mic impedance: 2.2K Speaker diameter 40mm Speakerfrequency range: 20Hz~20KHz Speaker impedance: 32 ±15% Speaker sensitivity: 105 ±3dB Wire length: 1.8m Working current:100MA Working voltage: DC5V Headphone connector: 3.5mm 3PIN (2 plug), USB, 3.5mm 4PIN (1 plug) Color: camouflage yellow, camouflage blue, camouflage grey