3.5mm headphone jack wiring installing on amplifier ; high impedance headphones are recommended

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eSynic Professional 16-150Ω Headphone Amplifier Portable Headphone Volume Amplifier Rechargeble Headphone Amp with 3.5mm Jack & a Two-Stage Gain Switch for MP3 MP4 Phones and Computers etc - Yahoo Shopping

What impedance should I choose?

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The 3.5mm headphone jack no longer works fine. Does anyone know if it is possible to use the two inputs on the side (blue and pink) to listen to music with my

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