<p><b>Features:</b><br> Mini HiFi Headphone Amplifier is Delicate, Compact, Lightweight, and Portable that it can be Carry Conveniently</p> <p>Built-in Rechargeble Battery, Charge by Micro USB Cable, More Convenient to charge<br> 3.5mm AUX Input and Output HiFi Earphone Headphone Amplifier with Volume Control</p> <p>High Quality Audio, Suitable for MP3 MP4 Mobile Phone Laptop PC <br> Noise Reduction Function, and Distortion with Enhanced Dynamics, Perfect Pure Stereo Effect, HD Voice Music Sound Quality Optimization </p> <p><b>Specification</b><b>：</b><br> Capacity: 2000mAH（3.7V）<br> Amp Using Time: More Than 12-15 Hours<br> Working Voltage: 8.3V/1A<br> SNR>120dB<br> Distortion: 0.004%<br> Output Power: 40Mw in Impedance 16Ω<br> Headphone Impedance: 16-300Ω<br> Dimension: 95 x 52 x 13(L x W x H)<br> <br> <b>Package Included:</b><br> 1 x Headphone Amplifier<br> 1 x USB Power Cable<br> 2x Audio Cable<br> 1 x User Manual</p>