Product Features Headphone amplifier Audio Input: 3.5 mm Jack, Audio output: 3.5 mm Jack Headphone amplifier using Time More Than 15 Hours Small size Portable Headphone Amplifier which make it convenient to carry High/Low gain switch for optimal performance of the headphones. Load Impedance 16-300 works for SONY, Sennheiser RS120, HDR 120 and beyerdynamic headphone.
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