PH-CX1 Portable Mini AUX Noise Reduction Stereo HD Audio Digital Headphone Earphone MP3 MP4 Amplifier

Features:Portable and Compact, convenient and easy to carry and useElegant Aluminum Case, Durable and Comfortable handheld feelingBuilt-in Rechargeble Battery, Charge by Micro USB Cable(DC 5V)Power LED and Charge LED Indicator SupportedOperational Amplifier Replaceable function to allow you update the product for higher tone quality conveniently3.5mm AUX Input and Output, high quality audio, fit for MP3 MP4 Mobile Phone Laptop PCNoise Reduction Function, and Distortion with Enhanced Dynamics, Perfect Pure Stereo Effect, HD Voice Music Sound Quality OptimizationSpecifications:Maxpower output: 130mW 32 loadLoad impedance: 16-300Working voltage: DC 3.7-4.2VCharge voltage: DC 5VFrequency Range: 20Hz-20KHz(3dB)THD: 0.001%SNR: 116dBSize: 105 x 52 x 12mm(4.13 x 2.05 x 0.47in)Package Included:1 x Headphone Amplifier1 x3.5mm AUX Input and Output Cable1 x User Manual