Custom headphones. Personalised headphones with your photos. You can put a different photo on each side. included: -Microphone. -Call management button. 3.5 mm plug. Characteristics: -Compatible with all digital devices of 3.5 mm. - Adjustable to fit all head sizes. -Microphone: Mic Frequency: 75-16000Hz Sensitivity: 42dB ± 2dB: Impedance: = 2.2Kohm: Directional: Omni-directional Sensitivity: 104dB: Impedance: 32 ohms Frequency response: 20-20000Hz -Plug: 3.5 mm. -Cable Length: 2.0m.