The high-fidelity Texas Instruments TI6120A2 headphone amplifier features a dual gain switch that can handle headphones and IEMs of both high and low impedance. Know a song that’s gotta be shared? Two 3.5-millimeter headphone jacks allow you and a friend to plug in and listen at the same time. A 3200-mAh battery offers up to eight hours of playback, and can even charge an Android phone via the USB host port.

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