QKZ DM7 In-Ear Earphone Type: Piston In-Ear Earphone Material: Zinc alloy Metal CNC Line Length:1.2m Speaker: 9 mm NdFeB speaker Speaker Power: Rated input power: 3mW, Maximum input power: 5mW Impedance: 32Ω±15% Speaker Sensitivity: 120±2dB (at 1KHz 1mW) Speaker Frequency Response: 8-22K Hz Microphone Sensitivity: -42dB±3dB1kHz, 3V 0dB=1V/pa Operation Temperature: -10 Celsius --- 40 Celsius