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Feature

Headphone amplifier using Time: More Than 15 Hours, Load Impedance: 16-300.
High/Low gain switch for optimal performance of the headphones.
Portable Headphone Amplifier which make it convenient to carry, can output remarkable sound without distortion. Audio Input: 3.5 mm Jack, Audio output: 3.5 mm Jack
Headphone Amplifier works for SONY Sennheiser RS120, HDR 120 and beyerdynamic headphone.
iphone to headphone amp Note: Lightning to 3.5mm cable is not included, you need to buy it yourself